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Hello Guenther,
This is a fly that belongs in the family Stratiomyidae, Soldier flies.
I think it should be in the genus Hermetia, because it resembles Hermetia illucens a lot! Look in the diptera gallery of this site! http://www.diptera.info/photogallery.php?photo=137
It could even be this very same species, but I am not totally sure about that!
greetings,