Northern Prairie Wildlife Research Center
Pale, yellow or blue-green with cream and occasionally wine red markings, granulose. Thorax with very faint subdorsal line. Head triangular, light green with creamy band running to vertex. Horn attenuate, nearly straight, usually extending beyond rump, often bluish or black dorsally. In one-eyed sphinx (S. cerisyi), subdorsal stripe well defined and running length of body. Food: many forest trees, especially partial to willows and poplars. Caterpillar: June to November; 2 generations in South, 1 in North.