INSECTS INFESTING THE APPLE TREE. 



85 



CHAPTER XXXV. 



The Forest Tent Caterpillar. (Cal.) 



{Clisiocam.pa sylvatica. — Harris.) 



Order, Lepidoptera ; Family, Bombycid^. 



[Feeding upon the leaves of the apple, oak, cherry, and vari- 

 ous other trees, a bluish, slightly hairy caterpillar, sprinkled 

 all over with black dots, and with a row of oval or diamond- 

 shaped white spots on the back.] 



When young, these caterpillars live in communities under a 

 web which is spun against the trunk of one of the larger 

 branches of the tree, but as they grow older they disperse and 

 live singly, unprotected by a web. 



Fig. 55. Fig. 55.— Forest Tent 



Caterpillar-colors, bluish- 

 gray, white and yellow. 



When fully grown (Fig. 

 do) they measure about 

 one inch and six lines in length ; they then seek some shel- 

 tered place in which to spin their cocoons, Avhich are filled 

 with a yellow, mealy powder. 



The moths appear early in June ; their forewings are of a 

 grayish color, crossed by two parallel broAvn lines, the whole 

 space between them sometimes being of the same dark brown 

 color ; the male moth expands about an inch and three lines, 

 while the female expands about an inch and nine lines. 



Fig. oQ. — Moth and eggs 



Fig. 56. 



of Forest Tent Caterpil- 

 lar ; a, the eggs — color, 

 brown ; c, an egg highly 

 magnified, top view ; d, 

 three eggs highly magni- 

 fied, side view ; b, the fe- 

 male moth — color, brown- 

 ish-3"ellow. 



The female (Fig. 566,) 

 deposits her eggs in rings 



