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Collected among fallen leaves (Quercus/Ulmus).
Quite small, around 2mm.
The picture was made on Oct.27, 2005, Naro-Fominsk, Moscow region, Russia

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It is a species of Crossopalpus, e genus of very small dance flies belonging to the Hybotidae. The adults are predators, and the larvae are also presumed to be predacious, living terrestrial and maybe in humus-like dead wood. Based on the picture alone it will probably not be possible to identify it to species.

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Thanks a lot, especially for details on habits.
Family and genus are quite sufficient at my level of knowledge.