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Hello,

in passed may for a few days these gnats flew through my room (I have no idea where they came from). Can someone help with their identification?

Data: Germany, Lower Saxony, Rodenberg, 90 m, in the house, 31 May 2022.

Best wishes,
Tina.

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This dead specimen I found three weeks later at the window. This one still had all its legs.

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Wing venation, distortion-free.

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Megophthalmidia crassicornis,exactly. That's what it is. One of its kind in Europe. Mainland Europe, anyway.

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Thanks very much, Walther!

Where does this species breed?

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Its biology seems to be unknown ... By the way, good old Landrock considered it to be very rare in Germany, i.e. about the first half of the twentieth century.

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Thanks, Walther.
Back then, I had a vase with Apiaceae in it, but couldn't find any exuviae. Of another origin I couldn't think; then, they must have come in through the window(?). Nevertheless, it seemed as if they had hatched within my room, somehow. In other rooms of the house I saw none of them, neither in the garden...

Thank you also for the information on its rarity in Germany; interesting. The species can't be overlooked, it's really conspicuous (that said by a lepidopterologist, not a dipterist).