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Taeniopoda eques
Saguaro National Park East Elevation: 1544m
I just spotted similar one, I suppose these are common in Tucson Arizona.
This appears to be a Western Horse Lubber, and I found one in Arizona also: http://www.projectnoah.org/spottings/722...
And here's some more background on this creature: http://fireflyforest.net/firefly/2007/11...
Great find, it's such a beautiful insect. :)