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hi flyforum,

This looks like a Dilophus sp. to me..
Is it a male Dilophus femoratus?

robert heemskerk,

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It's a male Dilophus.
They can only by IDed by their genitalia.
However, D. febrilis is much more common than femoratus.

Theo Zeegers

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Hi Theo,

Are the Dilophus female sp. also difficult to identify?
Today I found very much Doliphus sp., It must be ~ 5000 (and more..)
male and female together.
place: Gaasperplas (Amsterdam)
size ~ 10mm

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This is a female D. febrilis, easily recognized by the very dark wings.
The only common species in The Netherlands.
And the only one outside the dune area (so far)


Theo Zeegers

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Hello!

Sorry for linking to a german post in another (my own) forum, but I did not get an answer there, whether the numerous Bibionidae which can be found now (photos from September-01) are also Dilophus febrilis. Is it normal to find 95% females and only occasional males? Thanks for any replies!

http://insektenfo...eadid=3037

(Click on images for larger versions.)

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Hi Juergen,

The answers to all your questions are: YES

Yes, it is normal to see many Dilophus in late summer,
Yes, they are D. febrilis (second generation)
and yes,
you see in some place more females.
Males form clouds as in Empididae, females are more frequent on flowers.
Yours are febrilis as well (females with dark wings, easy)

Theo Zeegers

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Hello, Theo!



Thanks a lot!



But I can't remember to ever have seen *that* many :-).