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Dear Jonas and Piet.
I have to say that I’d rather agree with name S. testacea by Jonas.
I regard the situation as follows:
1. According to Rozkosny, 1987 (A review of the Palaearctic Sciomyzidae):
Postpedicel yellow - dryomyzina
Postpedicel black – testacea
Well, not very convincing difference, but at least clear.
2. According to Vala, 1989 (Faune de France, Dipteres Sciomyzidae):
Postpedicel yellow. Male t1 and tar1 not entirely dark - dryomyzina
Postpedicel black. Male t1 and tar1 entirely dark – testacea
And the drawing of genitalia which are in my opinion similar for all Sciomyza including simplex.
As for colour of postpedicel and fore leg, I have in Zool Museum, Moscow a lot of specimens of Sciomyza which may be named either dryomyzina or testacea depending on one’s personal preference. I’d rather prefer the colour of fore leg, that is why I like Jonas’s ID more than Piet’s.
But the main reason why I regard this image as S. testacea is:
it is the same species and
Sciomyza testacea Macquart 1835 is older name than Sciomyza dryomyzina Zetterstedt 1846