Abstract
A certain amount of attention has been devoted to the subject of the external morphology of the Sphingidae, but so far as is known, the complete treatment of any particular species has never appeared in the literature. In this paper a detailed description of the morphology of an adult of a typical species is presented, which may serve as an example of the structure of the entire family. The tobacco hornworm, Protoparce sexta (Johan.), was chosen for this purpose because of its large size and availability. This species is a common pest of tobacco and tomatoes throughout the greater part of the United States, and its range extends to the West Indies and Central and South America.
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