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If Dolichopodidae, than Medetera, I think. The one who walk on tree bark most probably appear in amber.

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Yes, it is Dolichopodidae, but I have no idea about the genus

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Dolichpodidae but not Medetera

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Thank you Andrius and Kahis.
Yesterday I had opportunity to show this fly to Igor Grichanov, his answer was - around Chrysotus.
Nikita

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Dear fossil lovers,

I unfortunately have not a lot of experience with fossil dolichopodids, but quite some with extant species. And I can tell you with 100% certainty that this species in this piece of amber is neither a Medetera nor a Chrysotus. As far as I can see, it has the vein R4+5 and M1 diverging (like in Achalcus and Enlinia) and the hypopygium seems similar to that in Micromorphus.

Cheers,
Marc

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Nikita, sorry for a looong delay. I have finally named the fly: Thrypticus molestus Meunier, 1907. I hope a new generic name will soon be published for the species. BTW, R and M veins are clearly parallel on right wing.

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Thank you, Igor

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Now it is Medeterites molestus (Meunier, 1907).
See redescription and additional pictures here:
Grichanov I.Ya. 2010. A new genus of Medeterinae (Diptera: Dolichopodidae) from Baltic amber (Diptera). Caucasian Entomological Bull. 6(2): 209-212.

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Igor,

Thank you for keeping us up to date with the nomenclature. Is your paper available online somewhere? I cannot find it through Google. Maybe it is still too new for them! I hae got much of my recent literature from the palaeoentomological library. However, it seems to be close to death, as it is progressing at about the speed of a gasteropod with a sore foot.

These are really nice photographs that you have attached. Too many publications on amber palaeontology are let down by the quality of the illustrations.

Best wishes,

Peter

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Yes, palaeoentomological library is in standby mode. If somebody wishes pdf, please write me by email.