with a colony of caterpillars which feed under its protection (Fig. 
3). It is unfortunately often called in Illinois the tent caterpillar, 
but the latter name is properly applied only to a caterpillar, not 
often seen in this state, which makes a small compact web in the 
forks of a branch in spring, which it uses only for protection while 
not eating. 
The web-worm is an almost universal feeder and has been 
found on about a hundred and twenty species of fruit, shade, and 
ornamental trees, upon the leaves of which it feeds. It is one of 
the most annoying pests of the tree grower, its numerous large 
webs, enclosing brown, skeletonized leaves, making the tree very 
unsightly, and the injury done, as it spreads from branch to branch, 
often being considerable. While the caterpillars are growing they 
do not wander from their common web. but enlarge this to cover 
fresh leaves as fast as those within it are devoured. When they 
have nearly completed their growth, however, they scatter far and 
wide, running briskly about when disturbed, and feeding on almost 
Fig. 4. Fall Web-worm, Hyphaniria textor: a, b, 
larvae, light and dark varieties; c, pupa; d, moth, ' 
spotted variety. All slightly enlarged. (New Hamp- 
shire Experiment Station.) 
