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There is a key to genera with the references to Morge, Ozerov and others for each genus in the Contr. to Manual of Palaearctic Diptera vol. 3, 1998. So try Stackelberg in Bei Bienko plus Morge plus a few addenda by Ozerov for Caucasian stuff. I somehow do not believe Andrey is going to publish a key to Russian stuff in English :) - but, anyway, I'd like to translate it, as I did with Shatalkin's Lauxaniidae keys for Bernhard Merz in 1999.