Northern Prairie Wildlife Research Center
Green or yellow-green, heavily granulose, with markings often obscure; occasionally with wine red spots subdorsally, about spiracles, and prolegs. Thorax usually with faint subdorsal stripe. Head triangular with line of whitened granulose spots running to vertex. Horn somewhat arched below, extending to end of body; granulose, greenish or yellowish apically, often longer than that of small-eyed sphinx. Food: many forest trees. Caterpillar: May to November; 2 generations in South, 1 in North.