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Thank you Paul. I found Amaurosoma on Kahis'S site http://www.astro.helsinki.fi/~kahanpaa/diptera/list/online/node92.html and decided that I can stop nomenclature chsking:D.
In may key f1 yellow or with black line on dorsal part of f1. I decided that only black line is the case. If so - N. flavipes. N. inermis - f1 completely or mostly black.
Nikita
P.S. Spend a hell lot of time searching your Brachyopa elsewhere, but not in Syrphidae family:o