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Hmm, I am in trouble :)
I have determined the female as Heleomyza. cf. difficilis
but the genitalia of the previous determined male look like Scoliocentra sensu stricto.
Tony could you check by the male specimen the number of prosternal bristles (1 pair or more than 2 pairs) and the hind femur (if without brush-like spines or with such bristles on the lower inner side) ??.
Regards,
Andrzej