Northern Prairie Wildlife Research Center
Green, brown, or pinkish with highly variable brown and white mottling. Purple-brown head with thin black line to either side of midline. First segment of thorax with short brown and black knobs. Saddle often extends downward to touch legs on last thoracic, and second, third, and sixth abdominal segments. Food: oaks. Caterpillar: June to October; 2 generations.