a iad a 
Insects of Shade Trees and Their Control. 35 
FOREST TENT CATERPILLAR." 
Manner and amount of damage it does —Although the sugar maple 
is its favorite food in the North and oak in the South, the forest tent 
caterpillar will feed on almost any deciduous tree. Like most native 
insects it is very abundant and causes serious injury only during 
Fic. 19.—Forest tent caterpillar: 10, Female moth with wings expanded; 1/, male 
moth with wings expanded; 12, egg belt encircling twig; 13, side view of full grown 
caterpillar ; 14, cocoon in leaf; 15, pupa; 16, cast skins of caterpillars._ (Felt.) 
spells of two or three consecutive years. During these years, how- 
ever, it is capable of completely stripping the foliage of deciduous 
trees over hundreds of square miles. The stopping of trains, due to 
tracks made slippery by crushed masses of caterpillars which had 
144 Valacosoma disstria Hiibn. 
