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Diptera.info :: Identification queries :: Diptera (adults)
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Bibio pterostigma
jck
#1 Print Post
Posted on 04-05-2019 13:50
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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 13:51
 
Zeegers
#2 Print Post
Posted on 04-05-2019 15:57
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Location: Soest, NL
Posts: 13958
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Anglicus is quite unlikely at Apeldoorn. Can you check the front tibia ? Sure it is not leucopterus ?

Theo
 
jck
#3 Print Post
Posted on 04-05-2019 17:08
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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 17:12
 
Zeegers
#4 Print Post
Posted on 04-05-2019 18:04
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Location: Soest, NL
Posts: 13958
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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
 
Zeegers
#5 Print Post
Posted on 04-05-2019 18:05
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Location: Soest, NL
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as for the other records, these are from “lowland”-side of Apeldoorn, the only part I’d expect anglicus.

Theo
 
jck
#6 Print Post
Posted on 05-05-2019 07:14
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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]
 
jck
#7 Print Post
Posted on 07-05-2019 09:22
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Record this one as possible B. anglicus? Or B. leucopterus? Or forget about it....

James
 
Zeegers
#8 Print Post
Posted on 07-05-2019 18:49
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Location: Soest, NL
Posts: 13958
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I’d need a lateral shot of tibia 1....

can’t assess the spur from this angle

Theo
 
Zeegers
#9 Print Post
Posted on 07-05-2019 21:42
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Location: Soest, NL
Posts: 13958
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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
 
jck
#10 Print Post
Posted on 09-05-2019 07:03
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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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