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Hi Ruud and Chris,

thanks to both of you for your opinion!

@ Chris:
No, I think it stands between Stratiomys chamaeleon and S. potamida. I first also considered S. concinna and S. cenisa for being candidates, just by generell appearance. They look very similar, but S. concinna has a dark red/reddish 3rd antennae segment (while this fly here has completely black ones) and S. cenisa is definately not known north of the alpes.

Regards
Dirk