Rhagio

Rhagio is a worldwide genus of predatory snipe flies. Several species in this genus are referred to as downlooker or down-looker flies because they sometimes perch on trees trunks in a head-down position. There are approximately 170 species. They can be distinguished from other rhagionids by the open anal cell on the wings and the lack of a kidney...
Found on http://en.wikipedia.org/wiki/Rhagio
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