Northern Prairie Wildlife Research Center
Two very different forms: form pictured here unmistakable; other form brown, streaked with white and black, and oblique lines that run through spiracles. Head with broad dark band to either side of triangle, edged outwardly with pale band. Caudal horn replaced by eyelike bump. Food: grape family. Caterpillar: May through September; presumably 2 generations in Deep South, 1 generation in North.