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Brown body, brown wings
Florida to South America
Yes, it is a Sphinx Moth, Sphingidae. Unfortunately the picture is not as sharp as it should be for a safe ID. But I think it is most probably Protambulyx strigilis.
http://bugguide.net/node/view/616200/bgi...
http://bugguide.net/node/view/24324/bgpa...
Sphingidae, Smerinthinae, Smerinthini.