Northern Prairie Wildlife Research Center
Gray-brown stick mimic with second thoracic segment raised into shelf; body gradually thickening to back. Prothorax with dark middorsal stripe. Anterior face of thoracic shelf blackened to either side with 4 faint lines running down to first thoracic segment. Head dorsoventrally compressed. Head mottled with vague lateral striping and raised darkened wart at top of frontal triangle. Antennae long, last segment pale at base. Legs far forward on third thoracic segment. Dorsum of fourth and fifth abdominal segments with small darkened warts. Last abdominal segment with conspicuous paraprocts and sharp, whitish hypoproct. Food: many deciduous trees and shrubs. Caterpillar: May to November; 2 generations in North.