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1. I edited the thread's name, because this couple isn't Opomyza, but Geomyza hackmani.
2. Early june I did my best to find any Opomyzidae in Turkey, but without succes. In Sochi (Black sea) I found Opomyzidae even mid November. In Moscow region Aug-Sept seems to me the best month for Opomyzidae (also I found some in early May and late July). My test, best place is pasture sites with low (eated by cows, or splay, or slightly trampled down), but green grass. Than, sit still long enought and you will see them, lookink and acting like Sepsidae, but more flegmatic.
Nikita