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Hi! Silvius vituli is the old name for S. alpinus (although according to Olsufjev, 1977, alpinus is the nomen oblitum for vituli ;), hence in the soviet and post-soviet literature this species is still mentioned as vituli). So vituli in the gallery should be corrected on alpinus. There is a lot of confusion in the names of Diptera, especially in such a complex groups as Tabanidae, Ceratopogonidae, etc. And not the least cause of such imbroglio is the notorious "iron curtain".