Diptera.info :: Identification queries :: Diptera (adults)
 Bibio pterostigma
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| jck |
Posted on 04-05-2019 12:50
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Member Location: Posts: 1163 Joined: 21.08.12 |
I am trying to key this one and I would like an expert opinion on the pterostigma: is this one dark and clearly delineated (B. anglicus) or light and not clearly delineated? Personally I would choose dark but my experience of these flies is very limited. The fly is a male, 7-8mm long (measured), found dead. Am happy to post other photos if necessary. City park, Apeldoorn on 30/04/2019. James jck attached the following image:  [143.58Kb] Edited by jck on 04-05-2019 12:51 |
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| Zeegers |
Posted on 04-05-2019 14:57
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Member Location: Soest, NL Posts: 19363 Joined: 21.07.04 |
Anglicus is quite unlikely at Apeldoorn. Can you check the front tibia ? Sure it is not leucopterus ? Theo |
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| jck |
Posted on 04-05-2019 16:08
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Member Location: Posts: 1163 Joined: 21.08.12 |
What am I supposed to look for on the front tibia - not mentioned in the keys I have? Bibio anglicus does occur near Apeldoorn - you approved this one in 2017: https://diptera.info/forum/viewthread.php?forum_id=5&thread_id=79013 It's on Waarneming as - https://waarneming.nl/waarneming/view/137308208? I also have a record from 23/04/17 (4 females) and 01/05/2018 (3 females). All 3 records can be found on Waarneming.nl (all with photos). They all come from the same place. The dead male in my post is about 1 km away in a straight line. James Edited by jck on 04-05-2019 16:12 |
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| Zeegers |
Posted on 04-05-2019 17:04
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Member Location: Soest, NL Posts: 19363 Joined: 21.07.04 |
leucopterus has the first tibia slender and the inner spur about as long as the outer one. In other Bibio, the inner spur is much shorter. Theo |
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| Zeegers |
Posted on 04-05-2019 17:05
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Member Location: Soest, NL Posts: 19363 Joined: 21.07.04 |
as for the other records, these are from “lowland”-side of Apeldoorn, the only part I’d expect anglicus. Theo |
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| jck |
Posted on 05-05-2019 06:14
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Member Location: Posts: 1163 Joined: 21.08.12 |
As I said, I didn't know the tibia was so important so I didn't pay much attention to it when taking photos. This is the best one. I see what you mean about Apeldoorn - there is a big difference between the west side and the east side. James jck attached the following image:  [151.23Kb] |
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| jck |
Posted on 07-05-2019 08:22
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Member Location: Posts: 1163 Joined: 21.08.12 |
Record this one as possible B. anglicus? Or B. leucopterus? Or forget about it.... James |
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| Zeegers |
Posted on 07-05-2019 17:49
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Member Location: Soest, NL Posts: 19363 Joined: 21.07.04 |
I’d need a lateral shot of tibia 1.... can’t assess the spur from this angle Theo |
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| Zeegers |
Posted on 07-05-2019 20:42
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Member Location: Soest, NL Posts: 19363 Joined: 21.07.04 |
In male anglicus, costal cell is pretty brown So this should be leucopterus. But still, would be nice to have a better view of the front spurs. Theo |
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| jck |
Posted on 09-05-2019 06:03
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Member Location: Posts: 1163 Joined: 21.08.12 |
I'll settle for a possible B. leucopterus - the last details aren't visible on any of the photos. Thanks for all your help. James |
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