the i;ag-\vorm. 



27 



it is occasionally found in New York, and even Massachusetts, b 

 rarely and locally restricted that neither Dr. Harris nor Dr. Fitch men- 

 tion it in their publications on economic entomology. Wherever it oc- 

 curs it prefers the gardens and parks within or near the cities, being 

 much less abundant in the woods remote from cities, and this depend- 

 ence upon the vicinity of human civilization is more marked in this 

 species than in any of the others here treated of. 



FOOD PLANTS. 



The Bag- worm is known to feed on a large number of trees and shi 

 but has a predilection for certain kinds of coniferous trees, notably the 

 Eed Cedar and Arbor Vitas, and as these evergreens are much less able 

 to stand the loss of their foliage than the deciduous trees, the worms 

 are much more dangerous to the former than to the latter. The Hard 

 Maples are, as a rule, avoided by the worms, and it is also quite m I 

 able that they are not particularly fond of oak leaves and those of the 

 Paulonias. The Ailanihus trees are also generally exempt from their 

 attacks, either on account of the unpleasant taste of the leaves, 

 haps on account of the compound nature of the leaves, the worms 

 ening their bags to the leaf stems which fall to the ground in Fall. 

 With these exceptions.* the worms, when sufficiently numerous, do 

 great damage to most other kinds of trees used in our cities as shade 

 aad park trees. 



ENEMIES. 



The Bag-worm is so well protected in all its stages that no insectiv- 

 orous bird nor predaceous insect is known to attack it. In spite of 



Fig. 11.— Phnpla eei ■■■juigitor: a. larva; b. bead of do. from fin 

 pupa: d, adult female (hair line indicating natural use); e, end of ;: 

 men from abov< ; / same from the aide— all enl . 



the absence of predaceous enemies, the Bag- worm sutlers from the 

 attacks of at least six true parasites, while two others, which may be 



" The China trees of our Southern citi< - tins. 



