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Moscow region, 13 july, 3-4mm.
I think that it is Notiphila.
Among Notiphila fly shares charecters of N. stagnicola (wide forehead) and N. brunnipes (black t)

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Hi Nikita
Not Notiphila - they always have large bristles on the thorax, and on the dorsal side of the mid-tibia. This ephydrid is in the tribe Discocerinini, possibly Ditrichophora.

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Thank you Tony.
Stupid misID. Costa in basal part is so strong in compare site between R4+5 - M, that I regarded it is absence of costa.
In my key there isn't Ditrichophora:(
Nikita

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I found that in my key it is Discocerina (= modern Dicocerinini).
I've come to Discocerina albifrons = modern Ditrichophora palliditarsis.
Nikita