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Thank you Louis and Jan.
Jan, I think that north step near Kursk is new region for you (it is strange, but nobody worked in Kursk region, the nearest place with some information about Diptera is Voronezh with with examined fauna of Dolichpodidae (Negrobov) and some knowledge about other families).
25-26 May - no Opomyzidae collected
20-21 July - this fly, 2 G.tripunctata and a hell lot of O.florum - either oak forest and step on shadow places.
I think it will be more wise to send you specimen on this post for sure ID (along with Turkish material from last winter ect...)
Nikita