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During cold october in Moscow it is still usefull to open the windows for two profits: less sigaret smoke and some flies still coming:D
Could it be Fannia canicularis?

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Well, my first impression, too, but what the h*ll do I know of calyptrates...

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If not F. canicularis this is very close indeed. No features metioned in d'Assis Fonseca's key are shown which contradict that identification. A very nice photograph of a very important fly.Since you have a specimen I assume you used a key Nikita. Any problems or raised doubts?
Robert

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Thank you Paul and Robert.
I have only key "Diptera of european part of USSR". This is a grate job and with most families it still works, but with some families (including Fanniidae) this short key almost without illustration is almost useless.
Nikita