Northern Prairie Wildlife Research Center
Elongate, smooth, green to brown with faint dorsal and lateral stripes. Head with faint spotting forming short concentric bands. Dorsum with darker middorsal (heart) line edged with indistinct addorsal, subdorsal, and supraspiracular stripes. Second, third, and fourth abdominal segments with middorsal black spot, bounded with white laterally, near front margin of each segment. Often with dark lateral spot behind spiracle. Food: oaks, sweetfern, and presumably others. Caterpillar: June to July; 1 generation.