~ The caterpillar is brown, with a row of elliptical blue spots down 
74 MISC. PUBLICATION 273, U. S. DEPT. OF AGRICULTURE 
the center and two orange spots on each segment. On the sides are 
pale orange lines and spots. 
7 
FIGURE 33.—Great Basin tent caterpillar (l/alacosoma fragilis) : A, Adults, natural size; 
B, larva, pupa, and cocoon, X 2. 
LOOPERS, SPANWORMS, OR MEASURING WORMS 
(Geometridae) 
: 
j 
i 
The leaf-feeding caterpillars of this family of moths infest a great 
many species and varieties of trees and plants. Some species are _— 
among the most destructive defoliators of forest trees. The cater- _ 
