Northern Prairie Wildlife Research Center
Superbly camouflaged for resting on bark. Grayish body vested with long setae on lateral fleshy lappets. Dorsum of third thorax segment with enlarged set of brown or red-orange knobs; when alarmed exposes dorsal black band from fold behind warts. Larch tolype (T. laricis) similar but smaller, with enlarged knobs on fifth abdominal segment, and on conifers. Food: wide range of broadleaf trees and shrubs. Caterpillar: June to August; 1 generation.