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Photo#217336
Flower Longhorn - Xestoleptura crassicornis - female

Flower Longhorn - Xestoleptura crassicornis - Female
5700 feet at the Mountain Haus terminal, Silver Mountain, Shoshone County, Idaho, USA
August 16, 2008
ID based on these comments:

Xestoleptura crassicornis. You can tell by the orange antennae and glossy surface of the elytra. The elytra are also a little more parallel-sided. X. crassipes has the antennae black to yellowish-brown, and the elytra duller.
… Dennis Haines, 12 August, 2008 - 3:27pm