Northern Prairie Wildlife Research Center
Smooth, elongate, fashioned with numerous wavy stripes; color variable but usually with black subdorsal stripe and darkened laterally; venter pale with thin pale stripes. Head grayish with darker mottling, dark spots smaller or more diffuse than those of hemlock looper. Setal bases not darkened. Dorsum of eighth abdominal segment weakly humped. Thoracic legs and sixth abdominal proleg pale orange-tan, and mostly unmarked. Food: especially pines. Caterpillar: June to October; 2 generations.