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In the high north of Russia near Vorkuta I caught a pair of Psilids in the genus Psilosoma (male with enlarged hind femora).
As you can see the hind femur of the male is enlarged and arched, and it also has strange processes on the ventral base of this hind femur. It is not P. lefebvrei (hind femur looks different according to Bei-Bienko), so according to Fauna europaea it should be P. audouini.
Or is it something else?
Greetings

Female