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Hello Juergen,
As in a lot times, Paul beat me to it and was just a click faster!;)
But indeed, I want to confirm that this is surely NOT a Brachyopa sp.
In this picture the best characteristic is the shape and color of the head, which is different in Brachyopa!
Look for example at: http://perso.wanadoo.fr/cyrille.dussaix/Brachyopa_pilosa/B.pilosa-illus.htma
Most of the Brachyopa's have a distinct snout which is not there in this picture!
So I support Paul's idea of it being a species of Heleomyzidae!
Greetings,