Diptera.info :: Identification queries :: Diptera (adults)
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 Phaonia resembling rufiventris
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| philporter |
Posted on 12-12-2010 16:04
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
This resembles rufiventris quite well, but has exnsive dark base to scutellum, more yellow shading in wings and infuscated cross-vein, 2 prs pre-sutural acrostichals, 3 posterior bristles on mid-tibia, which adds up to P. bitincta but that would be a great rarity in Britain I think. Any other options?
philporter attached the following image:  [85.25Kb] Edited by philporter on 12-12-2010 16:12 |
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| philporter |
Posted on 12-12-2010 16:05
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
#2
philporter attached the following image:  [86.38Kb] |
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| philporter |
Posted on 12-12-2010 16:06
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
#3
philporter attached the following image:  [91.85Kb] |
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| philporter |
Posted on 12-12-2010 16:06
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
#middle tibia
philporter attached the following image:  [76.58Kb] Edited by philporter on 12-12-2010 16:07 |
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| Stephen R |
Posted on 12-12-2010 16:19
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 Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
If the arista is short-haired, P. subventa. |
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| philporter |
Posted on 12-12-2010 16:51
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
Hi, Stephen, thanks for your reply Unfortunately the antennae are missing on this specimen; apart from that it would be OK except that there are 3 not 2 posterior bristles on the middle tibia, which is a main distinguishing feature of bitincta in Fonseca. I have two similar females which have short-haired arista and 2 tibial bristles which I intend to post up if I can't nail them any other way; they are very distinctive with orange abdomen but with grey dust bands on the apical margins of tergite 3. Do they ring a bell at all? |
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| Stephane Lebrun |
Posted on 12-12-2010 16:59
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 Member Location: Le Havre, France Posts: 8248 Joined: 03.03.07 |
Sometimes, even if rare, P. subventa has 3 p. setae on t2. I see that the 2 presutural black stripes are rather broad, what that would support Stephen's opinion.
Stephane. |
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| philporter |
Posted on 12-12-2010 19:03
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
Thanks for this interesting conclusion, Stephen and Stephane. Another little gem to add to my new collection of priceless tips for identification in the future.... Best wishes Phil Porter |
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| Stephen R |
Posted on 12-12-2010 21:31
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
Here is another example: http://www.dipter...d_id=34575. |
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| philporter |
Posted on 13-12-2010 11:45
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Member Location: Lincoln UK Posts: 554 Joined: 07.02.07 |
Thanks Stephen, I see that this fly also has 3 posterior bristles on mid-tibia, so the character seems quite unreliable. Regards Phil Porter |
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| Stephen R |
Posted on 13-12-2010 15:14
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Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
Yes, it seems you need the longer-haired arista as well to identify bitincta. |
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