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I catched 3 flies, but one escaped(!?).
Do not know how but there are two left.., and I will bring them tomorrow to the lab (Theo Z.)

regards, Robert heemskerk

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So you caught 2 flies?
While you keep them (are they dead now? let them dry and keep them dry), maybe you can make some extreme close-ups for us, the viewers? Please make a very close picture of the spines of the frontal tibia. And please a picture where we can see the color of the legs and of the hairs on abdomen and thorax (a good picture from the side will do).

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The size is less then 10mm, now I count 7-8mm and with my magnifying glass I see a lot of hair on the thorax, on the first legg I see one strong/long (end)spine which is coloured (brown/red).

Today I made one picture which is a little bit better then the first one, it was difficult to find one today. I saw a lot of them flying (~100)

Tomorrow I make another picture (I hope better)

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Definitely a Bibio spec.! Probably B. lepidus or B. clavipes. Both are autumn species.

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IMO they may just as well be the same species...

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Congratulations again.
I agree with Laurens: Bibio clavipes (or lepidus).
IN agreement with my first ID.

Theo Zeegers

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This is a picture with more details..

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another viewon the front leg.
Legs seems to be black!, the long strong spine on the frontal leg looks a little red/braun.

This afternoon I brought the fly to the ZMA-lab, Theo can tell more soon I think.

regards Robert Heemskerk,

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Hi Robert,

Your last posts removed all doubts: male Bibio clavipes.

You can see
* the terminal spine on tibia 1 (-> Bibio)
* the typical slender base of femur 3 (-> clavipes or lepidus)
* the stigma which does not enter the costal cell (9-> clavipes)

Why are you so bothered about the black legs ?
Legs are black in clavipes.

Thanks


Theo