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Hi Eugen, I've never seen one here in Franconia, but it could probably be a Chrysomya albiceps.
Southern species and very rare in Germany until now (2008 2nd find):
https://www.zobod...9-0103.pdf

Greetings, Eric
p.s. Nice photos showing "the whitish-yellowish pollinosity on the face, white anterior spiracles, dark posterior edges of the abdominal tergites" (cited from the above-mentioned PDF)!