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Widespread, but not common, on the stones near streams, 5mm.

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I think, I found the answer. Another fly collected (looks like same genus, but another species).
I think it is Lauxaniidae, Homoneurinae, new species of Prosopomyia.
Tomorrow I'll go to search more.

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Several features on this fly (head profile; size, shape and angle of wings; mid tibial spurs) suggest that it is mimicking an auchenorrhynchan homopteran. Why would it do that, I wonder?

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Hehe, for some predatory insects it is no use to try to catch hoppers. These simply jump away too quickly. So if a predator thinks you will be long gone before you can be caught, well I guess that might be advantageous.

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I am not familiar at all with the flies from the Far East. When I saw Nikita`s photo I thought immediately about Peplomyza, a Lauxanid genus. Peplomyza keep its wings very similarly.

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And this fly lives on large stones in forest streams (it is why not easy to collect). Being disturbed it goes aside like Cycadellidae.

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Thanks, that makes sense!

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Yeah, that grey matter here above sometimes does what it is supposed to do.

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Today collected in good amount.
Wait for Prosopomyia thaii Shatalkin
Nikita

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I've got news that Shatalkin ID fly as species of genus Cestrotus. As far as I understood it is difficult genus with flies from Afrotropical and Oriental region and species level ID takes some good time.
I found 1 image in i-net in:
http://www.museums.org.za/bio/insects/flies/lauxaniidae/index.htm
Nikita