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Thank you, Theo.
Before the enquiry I did a picture comparison and ended up with Berkshiria hungarica, mainly because of the different antenna shape.
Since the species has been found in Poland, the Czech Republic and in 2013 also in Bavaria, I hoped that it had now arrived in Saxony. What a pity!
How do the species differ? In the gallery, Neopachygaster meromelas has a dark arista and Berkshiria hungarica a white one like my fly. I attach a picture of another fly from the same place with better visible arista.
Best wishes,
Marion