122 



THE FOREST TENT CATERPILLAR 



Fig. 49. — Baltimore Oriole attacking nest of American 'J er.t Caterpillar. 



hairy caterpillars, being among the most destructive enemies 

 of the common American Tent Caterpillar. (Fig. 49.) They 

 should be encoura2:ed to nest and remain about the farm and 



garden. 



INSECT PARASITES 



The most numerous parasites of these caterpillars were the 

 small two-winged flies called Tachina flies. At least three 

 species ^ of these friendly insects were destroying the hosts of 

 caterpillars. One of these flies is represented somewhat mag- 



1 The three species were kindly determined by tlie Entomological Division of the 

 U. S. Department of Agriculture as Tachina imlla Walk., Exorista ftitilis O. S., 

 Front'nia frenchli Will. 



