Northern Prairie Wildlife Research Center
Green with whitish dorsum and hourglass-shaped midabdominal saddle, pattern highly variable. Head brown to purple-black, paler medially; vertex produced into knobs. Saddle starting on last thoracic segment, widening to third abdominal segment, narrowing between fourth and fifth segments, where it may be infused with yellow, then widening again to rear. Dark lateral markings often on last thoracic and first, third, fourth, sixth, and eighth abdominal segments. Food: many forest hardwoods. Caterpillar: June to November; 1 or 2 generations.