Insecta: Coleoptera: Phengodidae
I'm not sure what the species is, but it's one of these:
The larva is a glow worm, sometimes called a railroad worm which is actually the female form of the bug with the crazy antlers.
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Branham, Marc. "glow-worms, railroad-worms." 2005. 28 May 2007 <http://creatures.ifas.ufl.edu/misc/beetles/glow-worms.htm>
"Glow Worm Beatles" http://bugguide.net/node/view/9382
BugGuide "Phengodes plumosa" 2006. 28 May 2007 <http://bugguide.net/node/view/46385>