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This was also found in a swimming pool.

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A chloropid (Oscinellinae) certainly, but proceeding from that observation is tricky, to say the least.

The long proboscis reminds me of the genus Oscinimorpha...

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Hmm, the wing venation does not say Chloropidae to me. I'd suggest you try to compare with Milichiidae: Leptometopa.

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Oh dear, you can be right, I forgot the whole family of Milichiidae and Leptometopa is unfamiliar to me as a genus. I've understood that the difference between Chloropidae and Milichiidae lies i.e. in the venation of the basal half of wing. Not too distinct here...

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As a rule of thumb: In Chloropidae the R and M veins in the apical part of the wing are located in the anterior 50-60%. This specimen clearly has veins in the posterior part of the apical half.

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Thanks for the help!

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Looks like a female of Leptometopa latipes, see http://milichiida...pa-latipes.

When I try to separate Milichiidae and Chloropidae, I mostly look for the setae on the frons (Milis with, Chloros without) and the little 'wave' in the posterior wing vein in Chloropidae (straight in Milis).

Irina

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Thank You Irina!