THE INSECT WORLD. 



267 



species often becomes a serious pest in cities on shade-trees. 

 There are two broods, the second being usually the one most 



Fig. 288. 



The fall web-worm, Hyphantria cunea.—a, b, c, varieties of larva ; d, e, pupa ; /, moth of 

 the normal white form. 



noticeable, whence the nam.e " fall" web-worm, to distinguish it 

 from the common orchard tent-caterpillar, which appears only in 



Fig. 289. 



Hyphantria cunea: variations in the markings of the wings. 



spring. A large variety of trees and shrubs is attacked by this 

 insect, and where abundant it becomes a great nuisance. Usu- 



