THE FOREST TENT CATERPILLAR 



Fig. 49.— Baltimore Oriole attacking nest of American Tent Caterpillar. 



hairy caterpillars, being among the most destructive enemies 

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

 should be encouraged 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- 



> The three species were kindly determined by the Entomological Division of the 

 U. S. Department of Agriculture as Tachina mella Walk., Exorista futilis O. S., 

 Frontina frenchii Will. 



