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I wonder would it be possible to tell something about the fly on the image like that (sorry).

I saw these flies (quite a few) on the trail in a forest-park of Moscow (Russia) on the December 19, 2011. The size of the fly was roughly 4 mm long.
They were sitting on the freshly fallen snow, never flying (like winter crane flies that I also saw these) but when approached they rather tried to escape by running on the surface of the snow.

Could it be something like Limosina silvatica?

Thank you.