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Hi J?rgen,

This is not a member of the family Sepsidae but a member of the family Opomyzidae, more specifically a member of the genus Geomyza (a male specimen). Most of the species of this genus don't fly very good, they ar much better at walking. They do have a bit sepsid-like behaviour. Although you don't see them very often in the field, they are very often present. If you go sweeping with a net you will find species like Geomyza balachowskyi, G. tripunctata, Opomyza germinationis, and a bit less frequently O. petrei, on many locations. Other species like Geomyza apicalis are rather scarce in collections. Even by sweeping with a net you will often miss this species, although I have the experience that collecting with pitfall traps is a good method to collect this species.
I am not entirely sure which species you found. If you have more pictures of this species it may be possible to tell the specific name. I am always interested in material of this family (specimens or pictures).

Best regards,

Jan Willem