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It seems that it is Fannia, A short and c-shaped. This image with visible t3

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Two questions, please:
1. This is female? On same bark there are more rare, smaller, more blackish flies, is it males of same species?
2. Life on bark helps to ID species? What the hell they do on the bark?
Nikita

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1. Both photos are of femles. For males - catch some and tell us :)

2. Do a degree. Quite a few - but not all - Fannids life in various stages of dead and decaying wood.

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Ok, I go to search males.
Thank you Kahis.

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Nikita - there are many different places in woodland where Fannia breed. When you identify the males, you may have a better idea what this species does.
Trees are like furniture to flies. Sitting on bark is a safe place to be while waiting to mature, or find a mate. (There are not so many places for predators to hide, and it's a good place to keep warm in the sun.) It's like young people who stand around on street corners and visit the shopping mall - they're growing up and looking for mates too! B)

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Too last days I spend exclusively and lonely under lonely Salix alba tree. Nice place, flies are looking for mates, I'm looking for flies!

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I've got Fannia armata.
Seems correct?

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Female Fannia is as far as I get from the photo.

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The field season will be finished soon:
1. I've got some experience in Fannia ID
2. I collected 2 males of F.armata, but both in another place, without females.
3. In old place (very siutable for F.armata - several trees near pond where cattle rest on pasture) there are still only females.
4. Today I checked Fannia material in Moscow Zool Museum. There are several specimens of F.armata (all females) with det lebel of Adrian Pont (!) and no males.
5. So, it seems to me that this Fannia may regards as ID - 3ad+2pd on t2 ect, ect...
6. :D

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To be 100% sure I send a specimen of this Fannia to Grate Britan with kind help of Chris Raper.
Confirmed by Adrian Pont as Fannia armata :D