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For Insects, Spiders & Their Kin
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Photo#407795
This beetle is approx. 3/4

This beetle is approx. 3/4" long. Vivid colors and a single long horn on its head. Found in Texas around Bay City 5/26/10. - Phanaeus difformis - Male
Wadsworth, Matagorda County, Texas, USA
May 26, 2010
Size: approx. 3/4" long
This beetle is very colorful and has single horn on its head.

Moved
Moved from ID Request.

Nice One!
These guys are gorgeous, and they get to spend their day with poop.
It's a dung beetle: Genus Phanaeus, perhaps P.viridis
Lots of beetle enthusiasts are on the lookout for them, I know a bunch of folks who'd be envious of your good fortune in finding one.

 
Looks like a male P. difformi
Looks like a male P. difformis, based on shape of pronotal disk.

See: http://bugguide.net/node/view/155571