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Thysania zenobia
Erebidae, Erebinae, Thermesiini, Thysania zenobia.
http://eol.org/pages/559421/overview
http://www.texasento.net/zenobia.htm
http://bugguide.net/node/view/156381
There is also a Black Witch Moth with similar morphology and the markings on both species can vary quite a bit. Look them up and see what you think before accepting the suggestion. Nice spotting. Welcome to PN.