Leptogaster (coloradensis?) “Colorado Slender Robber Fly” Asilidae

Clinton, MT
July 25, 2015
Robert Niese


When we first saw this odd fly on our sheets during our mothlighting event last month, we thought it was a parasitic wasp! Turns out its a Leptogaster robber fly, a group of flies that are very poorly studied. Montana only has records for two species of Leptogaster flies, but it’s possible that several others occur here, and others may still be new to science. Robber flies are the tigers of the insect world and this individual likely joined us at the sheets to partake in a late night snack of gnats and midges.

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