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Probaenia sp.
http://bugguide.net/node/view/356050/bgp...
John La Salle, this link the picture element has the same design on the back, just do not have the tips. It will be something due to sex
Yep - that is starting to look like it.
The "back end" in yours has sharp points that aren't on the one in your BugGuide link.
I'm not a "bettle guy", but I think this might be one of the leaf-mining leaf beetles (Chrysomelidae) in the subfamily Hispinae.