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Hi John,
thank you very much :) that you point me to B. panzeri. I think you are right, as I now found the following charakteristic features of these flies: Antenna not plumose, thorascic dorsum reddish-brown, and segment 3 of the antenna with a pit close to the margin (the last feature is at the pictures of "my" fly not very clear).
Greetings Kuv