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May 14, 2023, Russia, Moscow reg., Naro-Fominsk env. On a dead aspen, many males and females, courting and mating.

Images of flies were posted here (as leucopeza, before examining male terminalia):

https://www.inaturalist.org/observations/161667952

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Seems to be A. pappi by genitalia as well as by by your pictures of imagines. Hope you have taken a series of specimens for further studies.

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Thanks a lot! Yes half a dozen males were collected. Apparently not yet formally recorded from Russia.