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Hi, I think it's a couple of G. rotundatum:
- thorax and scutellum (seen obliquely from behind) without continuous line of dusting
- parafrontalia for at most 1/2 - 3/4 of their length shiny black, sometimes only a narrow stripe along the upper eye rim
- scutellum only at the tip with a spot of dusting
T&H key, The Tachinids (Diptera: Tachinidae) of Central Europe