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Ceratomia amyntor
Black brown grey body is like a stick about 1 or 2 inches
Woodsy by river
Should be Ceratomia amyntor.
http://bugguide.net/node/view/3741/bgima...
http://www.silkmoths.bizland.com/Sphinx/...
Best match with yours:
http://www.silkmoths.bizland.com/Sphinx/...