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1. To my excuse (I thought it isn't S. stercoraria) I can say that Andrey spend about 15 min before coming to conclusion that it is S. stercoraria. Scathophaga decipens and Scathophaga obscura both has femorae dusting on basal 2/3-4/5, but never completely.
2. S.stercoraria is very variable species, there are boxes in Moscow Zool Museum with hundreds very different specimens of S.stercoraria - yellow and grey, hairy and bold, small and large... So, believ, S.stercoraria is really the best possible answer!
Nikita