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[781/0] Chamaesyrphys lusitanicus near Rozendaal from leendert on 2010-09-15 21:42:35.007536+02 -
Sweeping on heather (Calluna) vegetation adjacent to a pine forest just south of the firetower of the "Rozendaalse Veld" northeast of Arnhem on september 16 resulted in a male of Chamaesyrphus lusitanicus. The legs of this species seems to be mainly black in contrast to C. scaevoides. Also collected while sweeping where some Pelecocera tricincta (fairly common here) and several males of Cheilosia scutellata and two females of Cheilosia longula. Finally my first Chamaesyrphus in The Netherlands!
Greetings Leendert-Jan.


[780/0] Cheilosia canicularis in Groningen, Holland from sander_bot on 2010-09-13 18:07:53.12207+02 -
Hi all,
 
Last Saturday Bert Oving uploaded a picture of a possible Cheilosia canicularis on the website www.waarneming.nl: http://waarneming.nl/waarneming/view/49926781
He photographed the fly in Groningen, far north from the known populations in the Netherlands. I was not sure whether you can ID such a rare fly with certainty from one picture, so today I visited the site, and found indeed Cheilosia canicularis, 29 individuals in total! Here some pictures and the exact location:
 
They were mainly feeding on yellow Compositae. According the recent atlas, this species is only known from the South or Southeast in the Netherlands. Spring next year I will return to see whether I can find Cheilosia himantopus as well!
 
Greetings,
 
Sander


[779/0] Cheilosia aerea second generation from Frank on 2010-08-10 11:05:43.849404+02 -
Hi all,
last weekend I found some time to get out again in Belgium. At the Plateau des Tailles I visited the Anasimyia lunulata population that was discovered this spring (3males, 1 female still on the wing). At the old quarry of Aywaille I stopped to find some nice Paragus. I did not (except haemorrhous and pecchioli) but among the Cheilosia I collected (proxima type) I now found a male Cheilosia aerea. This is only the second record for Belgium (the other is in the KBIn collection in Brussels dating back to 1952). It seems however likely that most of the Meuse (Maas) valley will have this species. I also collected some C. velutina females. I now learned that C. aerea has a very similar head shape as velutina (lacking the mouth edge- what I thought was typical for velutina) so I will have to check also the C. velutina I caught this weekend (2 females)! In the Netherlands, C. aerea was thought to be a typical spring species, but elsewhere it is bivoltine. Now it seems possible that also the second generation may occur in the Netherlands (Aywaille is close to Luik/Liege, not more than some 40 km from the Netherlands).

cheers,
Frank


[777/0] Eristalis obscura from Frank on 2010-08-05 08:26:43.184774+02 -

It’s a dirty job but someone has got to do it. I am prepared to go whole the way when doing syrphids – I even enjoy looking at their genitalia (No, I don’t tell these things to my friends) but still I find little pleasure so far in studying Eristalis. Though they are big, it takes a lot of dissection to get to see the right things for ID. However, if you ever want to be sure of the E. rupium or E. picea males you find, or even more, if you ever want to find E. obscura (former pseudorupium) in Belgium, you have to.

In an attempt to find the latter species, I regularly collect Eristalis in the Hautes fagnes since 2 years. First, I collected E. picea alike animals (turns out to be rupium/picea in all cases). Last winter, I came to realize that my search focus should be more on E. nemorum alike animals (I’m talking males here).

Well, to be short, I found a male E. obscura end June this year at Jalhay!! Hypandrium and especially paramere shape (blunt top, see picture included) distinguish it clearly from E. picea/E. rupium animals. But then you run into trouble to distinguish it from E. nemorum.

van Veen (2004) and Van der Goor (1981) only revolve around the shape of the pterostigma (squarish, a bit elongate including the veins in my case; without the veins: clearly elongate). I however find the pterostigma shape sometimes difficult to judge. I therefore was glad to find some extra characters. Speight (2010) in his syrph the net keys suggests that posterolateral hairing of the fore femora is yellowish in nemorum, black in obscura. I caught some nemorum yesterday to compare – indeed the hairs are all yellowish in these animals, and black in my Jalhay animal. Bartsch (2009) also figures the surstyli (most keys don’t) of all Eristalis species. Surstyli shape is very different in nemorum (has a very long side lobe) versus obscura (triangular). My animal has triangular surstyli!

All in all, yet having nog experience with this species, I am now convinced I have found an E. obscura in Belgium!

This species is new here. Hippa et al. (2009), however, in their paper mention to have studied E. obscura material from Belgium. After contacting Hippa, and some people who provided material, it appeared that no one ever collected this species in Belgium (possibly there was an error when copying labels?). Also, Speight (2010) mentions this species from the Netherlands, but I have not found such records in the recent Syrphidae atlas (Speight mentions a lot of species from Belgium that have not been seen here so far). An old record existst though from the German Eifel, which may be close to where I found it now.

 

Sorry for the long story,

Cheers

 

Frankobscura hypandrium



[776/0] Platycheirus discimanus: gegevens 2010? from Frank on 2010-08-04 10:50:43.632092+02 -
 
Hallo allemaal,
in België schrijven we aan een artikeltje over de herontdekking van Platycheirus discimanus. De soort was 60 jaar niet meer gezien in Vlaanderen (40 jaar in Belgie als geheel) en werd dit jaar op 3 plaatsen "herontdekt" (8 waarnemingen, 10 individuen). Omdat de soort ook gevangen werd op plaatsen die al jaren goed onderzocht zijn, bestaat de idee dat het een goed jaar was voor deze soort. Dit willen we even toetsen aan de Nederlandse ervaringen. Werd de soort dit jaar door jullie gevangen? Bestaat de indruk dat ze talrijker/verspreider was dan andere jaren?
Laat het weten!
groeten,

Frank

[775/0] Eumerus sinuatus close to Belgium from Frank on 2010-08-03 13:18:26.775513+02 -
Much too quite here on the message forum - the second seosonal species diversity peak is going on now and we may expect nice observations again (bu all of you may be on holidays now:))

Well, to break the silence, an older report that I recently discovered when reorganising my collection. Around the year 2000 I caught some Eumerus with reddish marks on the abdomen at a chalk grassland in Jaulny in the French Lorraine. This place is some 60 km south of the southernmost point of Belgium (Belgian Gaume). While being more experienced now I immediately felt that these specimens (2) were not E. tricolor, as I had identiefied them by then (using the Belgian key of Verlinden): too large animals, different shape of the markings.

Re-identification now showed that they were Eumerus sinuatus! This is definitely the most northerly record in France, and also an eye-opener as before I would never have even considered this species when finding red-marked Eumerus in Belgium. However, this location is close the the Meuse (Maas) valley where it has a more or less continuous strip of habitat to travel to the north (depending on the distribution of the food plant that I have no idea of).
Anyways, keep this in mind when you find Eumerus with reddish marks in Belgium or the Netherlands!

cheers

Frank


[770/0] Orthonevra stackelbergi in Belgium from Frank on 2010-07-15 10:05:41.300326+02 -
Hi all,
inspired by the great catches of Bastiaan in the Hautes Fagnes, I also visited that area end June. At the place where Bastiaan found Chalcosyrphus curvipes, I only succeeded in finding 2 C. valgus :/. Nice were good numbers of Epistrophe obscuripes (more than 15) that all visited the last flowering bushes - none were seen on flowering herbs. At the same place I caught an Orthonevra with short antennae but the legs were definitily not all blackish - the knees were clearly yellow making the legs somewhat mottled. I released it since I guessed it would be a light form of O. nobilis. Later home I realized that I could have had a Orthonevra erythogena in my hands...
I than moved to another more northern part of the Hautes Fagnes east of Eupen. After seeing a superb Laphria ephippium, I also caught here an Epistrophe obscuripes, and on a flowering Viburnum I caught an Orthonevra what I thought was intermedia - long antennae, legs with much yellow, body very shining metallic-greenish. This species is rare in Belgium (4 recent pops in Flanders) but was recently also found for the first time in the Hautes Fagnes. My find therefore fitted that earlier record, but, "still nice to find a new population", I thought. After pinning the specimen at home and routinely checking the genitalia, it was immediately clear that this was not O. intermedia! Taking a handbook confirmed this and made suddenly clear that this was an Orthonevra stackelbergi!!! - luckily the male genitalia are very different between these two very similar species! The earlier observation of O. intermedia in the Hautes Fagnes (near Elsenborn) will also be checked - my guess is that it will also turn out to be O. stackelbergi. Orthonevra stackelbergi was not at all expected in Belgium - this species occurs in Scandinavia, the baltic states and further to the east. The nearest known populations are in eastern Denmark. A surprising find therefore. And possibly also O. erythrogena flies in ther Hautes Fagnes... Keep an eye open for Orthonevra the next time you visit the Hautes Fagnes!

Frank


[771/1] Re: Orthonevra stackelbergi in Belgium from Menno Reemer on 2010-07-15 13:28:19.000426+02 -

Hi Frank,

Yet another impressive record! (Are you aware of the fact that Van der Goot 1981 confused O. intermedia & O. stackelbergi? He later corrected this in Zweefvliegen in kleur and also e.g. Van Veen 2004 keys them out correctly, but I thought it could be wise to mention this...)

Menno



[772/2] Re: Re: Orthonevra stackelbergi in Belgium from Frank on 2010-07-15 15:17:07.916029+02 -
Hi Menno,
yes, I read about this confusion in Speight et al. 2010 (Syrph the Net). I have used van Veen and Bartsch to identify the individual. And I have several male O. intermedia to compare with (and I could compare with the photographs of typical male genitalia of O. intermedia by Gerard Pennards on http://pagesperso-orange.fr/cyrille.dussaix/).

cheers,

Frank


[774/3] Re: Re: Re: Orthonevra stackelbergi in Belgium from Frank on 2010-07-26 17:00:54.342812+02 -
As I expected the earlier record of Orthonevra intermedia from the Hautes Fagnes turned out to be an O. stackelbergi as well. This individual (male) was caught at Sourbrodt on 10 June 2006 and now confirmed as O. stackelbergi by Guy Van de Weyer.


regards
Frank


[768/0] Neoascia annexa bij Velp from leendert on 2010-06-22 23:06:57.184908+02 -

 

 

Vandaag zag ik bij het voormalige hotel Beekhuizen (Velp) langs de beek nabij een veld Groot hoefblad een vijftal vrij grote en slanke mannetjes Neoascia op en rondom een grote pol IJle zegge. Twee mannetjes heb ik meegenomen ter determinatie en het bleek hier te gaan om N. annexa. Naast Ubbergen de tweede vindplaats/popolatie van deze soort in Nederland. Op Groot hoefblad ving ik nog een mannetje N. obliqua en in een nabijgelegen pitrusruigte een mannetje N. podagrica. Vandaag ter plekke wederom een vrouwtje Pipiza quadrimaculata.

Groetjes Leendert-Jan



[765/0] Trichopsomyia lucida bij Rozendaal/Velp from leendert on 2010-06-20 22:41:02.521083+02 -
Op 12 juni ving ik in de uiterste zuidwesthoek van landgoed Rozendael nabij de A12 op Dolle Kervel een slanke Pipiza zonder vlekken op het achterlijf. Bij nader inzien bleek het om  een vrouwtje Trichopsomyia joratensis te gaan. Op dezelfde locatie werden als bijzonderheid op 2 juni en man Chrysotoxum octomaculatum en op 16 juni een man Myolepta dubia gevangen. Op 16 juni trof ik bij Beekhuizen (Velp) op Kruipende boterbloem wederom een vrouwtje Trichopsomyia joratensis aan samen met een vrouwtje Chrysotoxum octomaculatum en drie vrouwtjes Pipiza quadrimaculata. Op Zevenblad aan de oostzijde van Arnhem werden begin juni  wederom diverse Sphegina sibirica aangetroffen en verder onder andere Leucozona lucorum en een man Trichlypus primus en een man Orthonevra nobilis.

[763/0] Cheilosia lasiopa in Drenthe from sander_bot on 2010-06-19 15:59:24.496536+02 -

May 21 I caught a female cheilosia lasiopa. See pictures on : http://waarneming.nl/waarneming/view/48310178

 

Op 21 mei 2010 ving ik in Nationaal Park de Drentsche Aa een vrouwtje Cheilosia waarbij ik in het veld in eerste instantie als proxima dacht. Bevredigend was de determinatie niet dus ik heb haar verzameld. Vandaag heb ik voor het eerst beter naar het beest gekeken (het regent buiten). Ogen behaard, gezicht behaard, antenneborstel kort, schildje met zeer korte borstels en poten bijna geheel zwart, lengte 9 mm. Zodoende kom ik op Cheilosia lasiopa uit. De vlieg is gevangen aan de rand van een kruidenrijk veld en droog loofbos nabij de Drentsche Aa. Volgens de verspreidingatlas zou dit de eerste waarneming in Nederland sinds 1997 zijn. De meeste waarnemingen komen uit Zuid Limburg, maar er staat ook een stip dichtbij de Drentsche Aa. Ik zal de waarneming later dit jaar laten controleren omdat ik zelf geen ervaring heb met de soort. Hier 2 foto’s en de precieze plek: http://waarneming.nl/waarneming/view/48310178.  Met enige moeite zijn de korte borstels op het schildje en het behaarde gezicht te zien.

 

Groeten,

 

Sander



[764/1] Re: Cheilosia lasiopa in Drenthe from Menno Reemer on 2010-06-20 10:30:40.01224+02 -

Hoi Sander, de jizz is in ieder geval goed. De kenmerken die je noemt zijn moeilijk te zien, maar lijken inderdaad te kloppen. Verder heeft ie zoals het hoort donkere poten: alleen de basis van de schenen is licht.



[773/2] Re: Re: Cheilosia lasiopa in Drenthe from sander_bot on 2010-07-15 16:38:16.438199+02 -

I caught another Cheilosia lasiopa in the Netherlands, first record since 1997: http://waarneming.nl/waarneming/view/48990087#

Ik heb mijn waarneming inmiddels laten controleren door Menno Remmer, en het is inderdaad C. lasiopa. Hij heeft ook een mannetje Cheilosia spec. voor me gedetermineerd die ik 9 mei 2010 heb gevangen in de Lauwersmeer, Groningen. Guess what, ook een Cheilosia lasiopa! Dit mannetje zat op een van de eerste schermbloemen die dit jaar bloeiden in de wegberm. In de directe omgeving voornamelijk intensieve akkers.  http://waarneming.nl/waarneming/view/48990087#

 

 



[762/0] Chalcosyrphus femoratus not extinct yet from Bastiaan on 2010-06-09 14:12:23.086583+02 -
Hi All,

Last Friday the 4th of June I gave the Hautes Fagnes a visit. In total I found 70 species from which the title gives already a big clue isn't it ;-) Yes yes, I caught 2 males of Chalcosyrphus femoratus!!! (=Chalcosyrphus curvipes). This is one of those species you only dream about but aparrently it is possible to catch them. They where Xylota style, hoovering leaves of Alliaria petiolata in the early evening. Intrestingly a few years back I caught C.valgus at nearly the same place. C.femoratus is a rare specie within Europe but still reaches to the far east of Russia.

Other intresting species where Blera fallax, Epistrophe obscuripes (=similis), Chalcosyrphus piger, Xylota ignava, Chrysogaster virescense and rondanii. Also 2 Platycheirus that does not key out; one has this finger like extention (v.Veen.p176 q 25a) on Trochanter 2, does not have spots on tergite 2 and only small spots on T3 and T4, its a very dark specie also it isn't P.speighti and an other one with cylindrical tibia 1 that does not look like a Melanostoma specie, but you never know when they sorted out the Melanostona genus.)

Past Month were good too:
  • 1-13 May in Italy (Roma): Pipizella maculipennis, Myolepta nigritarsis and potens, Orthonevra plumbago, a strange Epistrophe specie that looks like euchroma (same kind of small spots at the tergite corners) and much much more still to be identified...
  • 18 May: Sonian Forrest(B): Mallota fuciformis, Xanthogramma leatum and Brachyopa insensilis
  • 23-24 May: Vosges(FR) Meligramma cingulata, Cheilosia subpictipennis, Brachypalpus eunotus, ... more to be identified

Cheers,
        Bastiaan


[766/1] Re: Chalcosyrphus femoratus not extinct yet from leendert on 2010-06-20 22:53:26.960135+02 -

Hi Bastian,

Nice catch! A few years ago, somewhere in July, I saw a specimen of Chalcosyrphus femoratus sitting on a boardwalk of "Plattes Venn" at the eastern fringe of The Hautes Fagnes. Unfortunately I was not able to collect it from the wood. That day Xylota species were numerous around.

Greetings Leendert-Jan van der Ent

 



[767/2] Re: Re: Chalcosyrphus femoratus not extinct yet from Frank on 2010-06-21 10:24:41.174285+02 -
Hallo leendert,

great find! Since the whole syrphidae community remains to some extent confused (since the revisions by Thompson) on what is exactly meant by Chalcysryphus femoratus, I like to follow the naming in the recent Dutch atlas where the original names are kept.
So, to be brief - what you saw at the Plattes Venn, was this indeed a Chalcosyrphus curvipes (the one with the big spine on top of tibia 3, large swollen femora 3 with long hairs)?
This species has been observed only once in Belgium in 1926. (and bastiaan now discovered it again).
Chalcosyrphis valgus that is closely similar to curvipes is relatively widespread in the Ardennes area where large Picea plantations are found.

Frank


[769/3] Re: Re: Re: Chalcosyrphus femoratus not extinct ye from leendert on 2010-06-22 23:17:21.270046+02 -

Hi Frank,

It was the VERY BIG one.

Greetings Leendert-Jan.

 



[759/0] Brachyopa obscura and others in Belgium from Frank on 2010-05-27 13:53:49.870678+02 -
The past weekend, I have spend much time in the area southeast of Charleroi in Belgium. Numbers of Syrphidae were incredibily low for the time of year, and even the abundant flowering crataegus were devoid of any syrphids. Anyway, after spending hours and hours of searching one can do some nice observations. A prime goal of this visit was finding brachyopa obscura. On 23 May I spend some hours near some Populus and Alnus in a small river valley in a large forest. These trees attracted good numbers of (male) Brachyopa. At only two trees, I had counted after 2 hours 1 brachyopa vittata, some 10 B. testacea, 20+ B. pilosa, 10+ B. scutellaris, 10+ B. bicolor and possibly (still need to check this) some B. insensilis. Finally alse a tiny orange Brachyopa arrived which prooved to be a B. obscura! In total I observed three males. I also did some nice behavioural observations which I hope to report in a article on this species.
I also spend some time here on the many chalk grasslands and could find Merodon rufus (population known for some ten years now), Eumerus tricolor and likely also Paragus albifrons (needs further checking). Also the usual Pipizella (viduata, divicoi, zenggenensis) were found. At several places we saw Xanthogramma laetum and a surprising find here was chalcosyrphus valgus indicating it may be spreading westwards in Belgium.

Frank


[758/0] Mallota fuciformis bij Winterswijk from Gerard Pennards on 2010-05-22 23:19:09.14355+02 -

Vandaag (22 mei) ving ik ten zuidwesten van Winterswijk een vrouwtje Mallota fuciformis op meidoorn. Dit op de top van een ouwe vuilstorstplaats die ze bedekt hadden en beplant!

Errste vangst sinds lange tijd uit deze hoek.



[757/0] Pocota, Callicera en Criorhina from leendert on 2010-05-22 22:22:23.311746+02 -

Vandaag even langs geweest bij de Meidoornstruwelen onderaan de Kamerdalseberg tussen Velp en Rheden waar ik eerder Pocota personata heb gevangen. Er vlogen nu twee mannetjes Pocota, helaas out of reach. Verder zag ik zowel een mannetje Callicera fagesii als een mannetje Callicera rufa. Ook waren enkele mannetjes Criorhina pachymera en Criorhina flocosa present. Beide soorten gedroegen zich zeer territorial en verjoegen zelfs de talloze aanwezige gouden torren, toch een behoorlijk maatje groter, en zelfs enkele meikevers.



[756/0] Cheilosia himanotopa bij Arnhem from leendert on 2010-05-21 22:41:06.407967+02 -

Vandaag ving ik in Heemtuin Presikhaaf (Arnhem) een grote Cheilosia op een blad van Groot hoefblad. Bingo een vrouwtje C. himanotopa dus.

Groetjes Leendert-Jan

 



[755/0] wederom Brachyopa dorsata bij Velp from leendert on 2010-05-21 22:38:19.253234+02 -
Gisteren zag ik bij een afgezaagde stam van een oude berk ten noorden van de begraafplaats bij kasteel Rozendaal een Brachyopa op de grond op dode bladeren zitten op enkele tientallen cm van de stam af net als de B. vittata van eerder dit jaar. Na vangst bleek het wederom te gaan om B. dorsata. Ik ving ter plekke nog twee mannetjes en zag er nog enkele zitten. De mannetjes B. dorsata gingen na verstoring weer een stukje verderop op de grond zitten nabij de stam maar nooit op de stam zelf of in kleine struikjes of grashalmen in de buurt. Ook vlogen hier enkele mannetjes B. pilosa rond die i.t.t. B. dorsata niet op de grond op dode bladeren zaten maar op grashalmen. 


[754/0] Pocota personata bij Velp from leendert on 2010-05-21 22:29:52.932148+02 -
Eergisteren ving ik ten westen van Velp op Meidoorn een perfecte hommel-imitator, een mannetje Pocota personata. Even verderop bij mijn favoriete meidoornhaag nabij een Beukenlaan ving ik maar liefst 4 soorten Criorhina (mn C. berberina var. berberina, mn C. asilica en diverse mn en vr C. pachymera en C. floccosa). Ook Psilota atra was net als vorig jaar hier present met een mn en een vr. Verder leuke zweefjes waren hier diverse mn en vr Brachypalpus laphriformis en Chrysotoxum vernale en een vr Parasyrphus malinellus.

[753/0] Psilota bij Kootwijk from Menno Reemer on 2010-05-17 11:24:10.703914+02 -

Gisteren bij Radio Kootwijk: 6 x Psilota atra en 1 x P. anthracina op bloeiende meidoorn.

Ook leuk overigens was onlangs Cheilosia chrysocoma bij Diemen (Amsterdam).



[752/0] C. ranunculi from jonas on 2010-05-17 10:47:01.55933+02 -
Hi all,
yesterday I caught a Cheilosia ranunculi in Ostend, Belgium. (langsheen het kanaal brugge-oostende)
It was one male among many C. albitarsis. Many Ranunculus bulbosus was present, but the specimen itself was caught on Ranunculus acris.

Bye,
Jonas


[750/0] Trichopsomyia lucida near Arnhem from leendert on 2010-05-11 22:04:55.258576+02 -

A male Trichopsomyia lucida was caught when flying low above ground on a trail near an sunny forest edge in a botanical Garden in Arnhem, The Netherlands on april 23.

Op 23 april zag ik in Heemtuin Presikhaaf op een zonnig pad langs een bosrand laag boven de grond een Heringia-achtige zweefvlieg vliegen. Na vangst bleek het te gaan om een mannetje Trichopsomyia lucida. Voor mij een nieuwe soort en eindelijk een Trichopsomyia. Op 27 april zag ik in Heemtuin Presikhaaf ook nog een mannetje Criorhina pachymera.

Groeten Leendert-Jan van der Ent.

En nu maar hopen op warmer en zonniger weer...........

 



[749/0] Brachyopa vittata near Putten from leendert on 2010-05-11 21:57:10.341675+02 -
A specimen of Brachyopa vittata was observed flying and on the ground near an old trunk of Picea in the forest near Putten on April 25th. This is a very rare species in The Netherlands.

Op 25 april was ik op landgoed Schovenhorst bij Putten. Toen ik mijn kinderen uit het speelbos ging halen zag ik bij een oude omgevallen spar een Brachyopa vittata vliegen. Pogingen deze zweefvlieg te vangen, zonder net, mislukten omdat dit exemplaar zeer alert was en bovendien steeds naast de omgevallen spar op de grond op oude bladeren ging zitten waardoor hij vrijwel onzichtbaar werd voor het blote oog. Het zal wel een mannetje zijn geweest, maar dat kan ik niet met zekerheid zeggen. Voor mij, na eerdere vangst van B. dorsata, een leuk Brachyopa voorjaar. Zo zag ik op 28 april onderaan de Keienberg bij Velp een zwerm van ca 10 mannetjes B. pilosa bij een vlierstruik zonder dat hier een bloeidende stronk of boom in de buurt was. Dit gedrag kende ik nog niet van deze soort, wel van B. scutellaris. Verder vloog hier die dag als bijzonderheid een vrouwtje Syrphus nitidifrons.

 

 



[747/0] Rhingia rostrata (namens Sander Bot) from Menno Reemer on 2010-05-06 08:51:37.822999+02 -

[On behalf of Sander Bot, who somehow did not succeed in registering for this webstite:]

The 24th of April I caught a male Rhingia rostrata on the Sint Pietersberg, Zuid-Limburg, the Netherlands. In the Netherlands this species was only known from 3 records in the 19th century! 

I was in a curve on a forest track where the sun was shining on the path. This spot was good for many cheilosia variabilis sun bathing on the leaves along the path. I was curious how many there actually were so I caught them, marked their wing with a permanent marker and released them. While doing so, I saw a Rhingia sp. flying past quite slow and low, and because it appeared orange in stead of red to me I caught it. Unexpectedly, the margins of the tergites appeared to be orange indeed, so I immediately collected it. Back at home I identified it as a Rhingia rostrata. Photos, a short description (in Dutch) and the exact location can be seen on: http://waarneming.nl/waarneming/view/47593751 . On the same spot I saw 5 males Pipiza luteitarsis and a male Cheilosia semifasciata as well.   

The species might be expanding its range. Last year the species was caught in Belgium after an absence of more than 50 years (Menno Reemer pers comm). Maybe this will be the first of more sightings to come in Holland!

Greetings,

 

Sander Bot

 

PS: during the 70 minutes on that spot I caught 32 Cheilosia variabilis, of which 8 were recaptures.



[748/1] Re: Rhingia rostrata (namens Sander Bot) from Frank on 2010-05-06 09:34:38.587284+02 -
Last year, in fact three Rhingia rostrata (all males) were caught in Belgium after 65 years of absence, at relatively distant locations all in the Hautes fagnes area. (this one http://waarnemingen.be/waarneming/view/45151387 has been particularly nicely documented).
A paper that reports these new finds and the results of the re-examination of Rhingia rostrata of the collection in the Brussels museum has been submitted some months ago. In the same paper also the many new Belgian records of R. borealis are described and discussed.  The paper ends with the open question whether these three finds would indicate a resurrection of this species in mainland Western Europe and the advise to pay extra attention to Rhingia in forested situations the coming years...

Frank 


[742/0] Cheilosia nebulosa! from jonas on 2010-04-28 10:33:49.861115+02 -

Hi all,

18/04/2010, I discovered a female Cheilosia nebulosa in De panne, Belgium. Very nice, since the most nearby populations are situated in the UK and the haute fagnes where it has been caught only a few times. Most probably it has made a trip oversea!

At first I doubted about its ID due to the ackward location, but this weekend, Frank van de Meutter confirmed C. nebulosa.

Bye,
Jonas

(pictures: http://waarnemingen.be/waarneming/view/47596864)



[745/1] Re: Cheilosia nebulosa! from jonas on 2010-04-29 16:52:33.082784+02 -

hallo,

Ik had die op bloeiende sleedoorn (zichtbaar op die satelietfoto trouwens :-)), met vlakbij een 100-tal gulden sleutelbloemen. Het aangrenzend graslandje (met bijhorende orchissen) stond op dat moment eigenlijk niet echt vochtig, hoewel dit in de winter wel soms onderstaat. Duinpoeltjes zijn er zeker in de buurt! Verder was er in de nabijheid geen Salix te vinden. En kheb er eigenlijk niet echt op gelet of er al dan niet distels stonden ;) De omgeving bestaat vooral uit eerder lage begroeiing (tot 2m), vooral duindoorn eigenlijk...

Groeten Jonas

 

 



[744/1] Re: Cheilosia nebulosa! from Frank on 2010-04-28 23:30:03.517855+02 -
Inderdaad een heerlijke vangst van Jonas. Vanuit het vastelandperspectief een onmogelijke vangst, want hij zou noordelijker of hoger in de bergen moeten zitten (twee vangsten in Belgisch Ardeens massief). In Engeland is het echter een verspreide soort die het zwaartepunt in het zuiden heeft, en dus niet klimaatgebonden lijkt op de manier als op het continent. Vanuit het UK perspectief is de vondst dus enigszins te begrijpen, maar het blijft een grote verrassing. In Nederland zijn veel meer en veel mooiere duingebieden, dus potentieel is er zeker. Er wordt vermoed dat de voedselplant een distel is, maar Jonas moet maar vertellen of biotoop met distels aanwezig is (hij ving de soort op sleedoorn weet ik). In Engeland vliegt de soort wel maar van begin april tot begin mei, dus het loopt al op het eind.

[743/1] Cheilosia nebulosa! from Menno Reemer on 2010-04-28 22:48:19.760797+02 -

Hallo Jonas,

Hoe ziet de omgeving er uit waar je deze soort gevangen hebt? Is het vochtig? Zijn er duinplasjes oid in de buurt? Ben benieuwd of er in de Nederlandse duinen vergelijkbare plekken zijn...

Groet,

Menno



[741/0] Brachyopa dorsta near Velp from leendert on 2010-04-19 23:46:40.244136+02 -

Also in The Netherlands nice syrphids are flying all around. Last Saturday I colledted two males of Brachyopa dorsata on a flowering Prunus species near Velp on the southern border of the Veluwe. A third male was left on site. This is the second location of this species in The Netherlands after being discovered in 2007 for the first time. Also remarkable this day was a male of Dasysyrphus pauxillus and some females of Melangyna quadrimaculata. A male of this latter species I already saw on flowering Corylus avellana on februari 16th.

Greetings Leendert-Jan van der Ent



[740/0] Mallota fuciformis from Bastiaan on 2010-04-19 07:39:41.353382+02 -
This weekend (17 th of April) I have been looking for Syrphidae on Prunus spinosa (blackthorn) around the . I was able to see a lot of species already, like a few Epistrophe ochrostoma one Cheilosia chloris and some Criorhina ranunculi. Also to my surprise 2 Neoascia meticulosa as I did not expect them so early and the fact that I never have seen them before here in the Sonian Forest (Red Monastery).
The best specie I found was a Mallota fuciformis flying very quickly and sitting a few times nervously just on an unreachable place in the top of the blackthorn, very nice to see!


[739/0] New for Belgium: Heringia verrucula from Frank on 2010-04-16 15:25:11.29192+02 -
Hi all, fantastic whether yesterday 15 April so I took a day off and headed out to the north in a first attempt to discover Heringia verrucula in Belgium. Ecological knowledge on this species is poor, so the only things I could rely on was that it was seen recently near Hilvarenbeek, close to the Belgian border and that I had to search on Salix probably best close the wet woodland. At random I stopped near a mixed (mainly conifer) forest at Arendonk and walked into it. After more than one hour walking without seeing any flower I finally discovered an open area with a flowering Salix aurita. I spend three hours around this one bush and saw 21 species. All that may expected now (and even more) at such a place was present: Dasysyrphus pauxillus 3 males, Platycheirus discimanus 1 male, 1 female, Epistrophe ochrostoma 2 males, Orthonevra geniculata 3 males, Parasyrphus malinellus and lineola several, Melangyna 4-maculata 1 female and also 2 males Heringia verrucula!!! My very first attempt to find this species in Belgium was succesfull. It now remains to be studied what the actual distribution of this species in Belgium may be. I was very keen on finding this species, since it may be at his souternmost range limit here, and could be susceptible to global warming (it declined much in the Netherlands recently).

Frank


[738/0] Belgium stop press from Frank on 2010-04-11 20:45:00.031296+02 -
Hi all,
just some updates from the Belgian front.
Last week Platycheirus discimanus was finally rediscovered (twice in fact, two independent observers) for Belgium near Knesselare (which is close the the coast). Last Belgian observation was by Jan Lucas in 1972.

And one of the least suspected species in Belgium that was confirmed this year is Brachyopa obscura. The species was observed in 2005 by Bastiaan Wakkie near Olloy sur Viroin, but there remained some doubt. Now the species is found also in malaisetrap samples placed in 2006 in the marshy forest with lots of Alnus around the Lac de Virelles (near Chimay); and using new literature also the first obs now can be confirmed. At first I was puzzled that a B. testacea could occur in a marshy alnus forest without pinus or picea; but a better look revealed that this was B. obscura, and than this fits perfectly! The two localities are some 30 km from each other and are part of a more or less continuous large woodland of some 60 km. More populations may be found here. If some old marshy forest with many alnus and populus tremula also occurs in the Netherlands I would advise to also look here for this nice Brachyopa!

cheers

Frank


[734/0] Mallota, Myolepta and Brachypalpus valgus! from Frank on 2010-04-06 21:18:12.940599+02 -
Hi all,
indeed as Bastiaan already told I finally succeeded in finding something else than Myathropa in a rot hole. I found a rot hol in Fagus that itself is quite rare and special - very large but with a narrow entrance, and with nice wet substrate in it (sounds disgusting, I know). I have been looking for rot holes some time now, but they never had this type and volume of rotten moist substrate. The tree is not at all in a large forest, but rather at some distance of a small patch of wood. It is very close to where I live, and I have searched a lot here for hoverflies (140+ species in 3 years!!) but I never met a Myolepta or a Mallota. Now in this rot hole I found more than 80!!! larvae of Myolepta and a Mallota larva. I have not searched the rot hole fully, and there are certainly many more larvae inside (volume is some 20l I would say), especially of Mallota since I have not searched the deepest parts (where Mallota should be). Very curious indeed that I never saw a Myolepta around and that I now find more than 80 larvae in one tree! I guess they must be M. dubia since they live in Fagus, but why would not also M. potens be possible? Wait and see!

I have some larvae at home now, and try to breed them. The myolepta are very mobile and make small channels in the substrate every day. The Mallota however often remains at one place for several days and moves slower and much less often. I have them now since the beginning of march, but no signs of pupation yet. Since the Mallota did not pupate yet, it probably is not M. fuciformis which should nearly fly now - or either it is a larva that will do another year before pupation (hope not). I sincerely hope it is M. cimbiciformis; this species has not been seen in Belgium since the 19th century!
In search of M. fuciformis today I checked some flowering Prunus near Leuven (northeast of Brussels). I searched in a residential neighbourhood surrounded by old parkland (this may be better for mallota than the sterile managed woodlands around). Suddenly I was baffled by a very large bee-like hoverfly that dropped itself on a flower just in front of me. For three seconds I was watching a fabulous Brachypalpus valgus!! Then it flew of like a mirage and disappeared high in the trees. Only very few other hoverflies were seen (Parasyrphus punctulatus, Melangyna lasiophtama, first Eristalis pertinax, E. tenax, epibal). All is very late this year!
But yet a great start of the new flight season!
Frank
 


[735/1] Mallota, Myolepta and Brachypalpus valgus! from Gerard Pennards on 2010-04-06 23:31:59.364636+02 -
Frank, how do you get the substrate out when the entrance is that narrow?
Frank, hoe krijg je het substaat eruit als de toegang zo nauw is??

[737/2] Re: Mallota, Myolepta and Brachypalpus valgus! from Bastiaan on 2010-04-07 16:58:08.228336+02 -
Longtime agoo I tried this with Jeroen van Steenis and we used a flexible long tube. First we sucked a large amount of water into the tube and then turned the tube into a bucket which was hanging lower than the rotehole. All water will be transfered into the bucket. You might want to stir the water upfront. If the rotehole only got muddy substance you might try to fill it up with water upfront and stir it a bit upfront.


[736/2] Re: Mallota, Myolepta and Brachypalpu... from Frank on 2010-04-07 10:02:02.328877+02 -
Well, the entrance is a vertical cleft in which you can just enter your arm, however, it is not possible to get a folded hand out. This makes it a tedious work to get out some substrate. I try to attach a picture of the tree.
As I told earlier there is only scattered patches of deciduous woodland here, and some large pine woods. However, the forest pacth where the larvae were found has abundant holes in many trees. I never saw a place with so many holes. In managed woodlands one can walk a full day without finding a suitable rot hole for syrphids, is my experience.
cheers
Frank


[746/3] Re: Re: Mallota, Myolepta and Brachypalpu... from Frank on 2010-05-01 22:59:50.122767+02 -
Today, a first pupa of the Myolepta collected in the beech tree eclosed. A splendid male Myolepta dubia!

cheers

Frank


[732/0] M.quadrimaculata, Myolepta en Mallota! from Bastiaan on 2010-04-01 22:56:12.062697+02 -
Syrphids are starting to emerge again! On waarnemingen.be I found out that Melangyna quadrimaculara is flying again. Also Frank van de Meuter found a lot of Myolepta and one Mallota Larvae. Cheers, Bastiaan