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If the fly was from Europe I'd say Lispe for sure.

Xespok's Lispe is a female; in this genus (as in most flies) the females lack most of the modifications seen in males. The abdominal pattern can be quite different for males and females in this genus.

Just returned from the annual weekend meeting of Finnish (amateur) entomologists. Our small diptera group met for exchange of ideas and material, other entomologists were bombarded with pro-fly propaganda, strategic plans for the season were formulated, old stories swapped over dinner, windowsills checked for 'samples', the saunabath tested, B)B)B)