Hi Eric! In my eyes, this is one of two species that cannot be determined without a measurement:
Species Eulithis gracilineata - Greater Grapevine Looper
http://bugguide.net/node/view/40894/bgpage
Eulithis diversilineata - Lesser Grapevine Looper Moth
http://bugguide.net/node/view/52922/bgpage
Hope this helps!
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