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Well Tony, to tell you truth I'm not totally convinced too.
But at least, I keep fly obviously similar to Robert's one collected 31 May on tree bark in Mosc reg. This fly is also large (more than 1cm) and elongate, with same strong bristles. If I look at fly from behind it has Eustalomyia patterns, if on 90 angle (as on Robert's photo) it looks as Robert's fly. It has short arista hairs as Eu.histrio and 7av on t3 as Eu.festiva.
Someday I'll find answer...
Nikita