Amphion floridensis, the Nessus sphinx, is a day-flying moth of the family Sphingidae. The species was described by Pieter Cramer in 1777, and renamed in 1920. It is the only member of the genus Amphion erected by Jacob Hübner in 1819. It lives throughout the eastern United States and Canada and occasionally south into Mexico, and is one of the more commonly encountered day-flying moths in the region, easily recognized by the two bright-yellow bands across the abdomen.

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