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Thanks a lot. It must be Ethiromyia chalybea. This was my "working name" for him anyways. But I had him marked as weak ID. And after failing with two keys and not finding any proper pictures of males except the one linked identified to Poecilobothrus I put him up here. The bristles on the hind tibia looked conspicious to me. Also the black/blue color - I couldn't believe they wouldn't be mentioned in the keys. Seems also the hind tibia isn't that conspicious in the females?
Only now I found also this guy: https://diptera.i...d_id=69467. No idea why I missed him the last time. I searched for hours.
Best Regards,
Jan