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Dear Jürgen,

Thank you for your kind reply.

Good argument! Honestly, I was not aware that this species is also present in this area.... That makes it more complicated!

Do you know of any critera to distinguish both species based on photos? I may then look on other photos I took if I can find those criteria.

I do not know if the following is a strong or non-relevant criterion for the distinction of Peplomyza intermedia and Peplomyza litura (=> please disagree). Based on the photos I have seen from Peplomyza intermedia, there are just two but broad dark bands on the back whereas P. litura has four smaller ones. For example:
https://www.biodiversity4all.org/taxa/1087570-Peplomyza-intermedia
https://www.kozanek.com/en/insects/3289/59/3232/
https://www.izeltlabuak.hu/faj/peplomyza-intermedia

If (!) this should be a strong criterion, I would still end up with Peplomyza litura.

Best regards,
Thomas