It could be morning glory prominent(Schizura ipomoea) or unicorn caterpillar(Schizura unicornis). Its based on what kind of plant they eat.
http://bugguide.net/node/view/28016
http://bugguide.net/node/view/28015
But it is more like a morning glory prominent :)
http://mothphotographersgroup.msstate.edu/species.php?hodges=8005
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