Northern Prairie Wildlife Research Center
Bright green or red-brown with swollen third thorax segment into which head and first 2 thoracic segments can be drawn. Abdomen with small white to yellow spot on segment 2 and large oval spots around spiracle on third to seventh segments. Whiplike horn of early instars replaced with button in last stage. Thorax and anterior abdominal segments with dorsal , black spotting. Achemon sphinx (E. achemon) brown, orange-brown or yellow-brown, with larger lateral spots divided into 3 compartments. Food: grape family. Caterpillar: June to November; 2 generations in South, 1 in North.