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Pont & Meier 2002 (= Fauna Ent. Scand. Sepsidae) shows a strong dark shadow around the tip on R4+5 for S. caucasica.

I do believe that this fly belongs to Sepsis (I hope I'm wrong - Nikita I hope you caught some for later identification). Leafing through the book mentioned above I found Sepsis pseudomonostigma Ursu to be the closest match. This species should have an all-black thorax but color is not a good character in Sepsidae.