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Moscow region, 16 aug, 10-11, motionless on tree bark. Arista plumose as Calliphoridae.
Crazy idea came to my mind, could it be Oestromyia leparina?

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Hello Nikita,

Is it not Mesembrina meridiana?

greeting, robert

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It seems to me that you are right.
Thank you Robert.

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Next day I've found it under that tree on fresh cow dang in company with another Mesembrina mystacea.
Both collected and I have trouble with species level ID.
My key divide M. intermedia and M. meridiana by foretarsus colour.
Both flies have dorsaly foretarsomers all black. Ventraly second fly (female) has only fore tar1 red, as it has to be for M. meridiana, but first fly (male) has ventraly all 1-5 fore tarsomer red, as M. intermedia. Also size of first fly is obviosly less.

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"If I understand what Nikita is saying in then this fly is M intermedia I think?"
Thank you Susan, I forgot to search in our Gallery.
But photo by Gerard in Gallery is M. meridiana, as discribes my key - p1 cell apicali narrow, fore tar 5-3 red, the rest of legs - black.
My trouble was that fore tar 5-1 of my male is red, but only on ventral side.
Nikita

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Hi Nikita
Looking at Zimin's key (Keys to the Insects of the European Part of the USSR, 1969), I think that the fore tarsus of intermedia should have segments 2 to 5 reddish yellow all over, not just on the ventral side. Also if you compare figs. 3 and 4, there is a difference in the curve of M1+2. In intermedia it seems that the vein is curved closer to the wing tip. In meridiana the curve is more basal. It would be good to see a photo of intermedia to check whether this is a good character. Perhaps Kahis has a specimen and could take a photo of the wing for us?
As far as size differences are concerened, remember that muscid males are almost always smaller than females.

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... or in the end of august Andrey Ozerov will appear back in Moscow Zooligy Musem and I'll compare my fly with Mesembrinas collected by Zimin personaly...
Thank you Tony,
Nikita.