INSECTS AFFECTING PARK AND WOODLAND TREES 557 



which latter is used as an ornamental tree. Ordinarily it does not cause a 

 great deal of injury. The parent butterfly is a beautiful orange-red, dark 

 brown-marked butterfly with a wing spread of about two inches. The fore 

 wings have a number of irregular black spots, the outer margin being a 

 dull brown, while the greater portion of the short-tailed hind wings are 

 dark brown, the prolongations and posterior margin being blue. Dr Scud- 

 der states that this insect produces two generations in the South and but one 

 in the North, hibernating in the chrysalis. The eggs are laid during June 

 or early July, the caterpillars hatching in the latter month, and when quite 

 small conceal themselves in the leaf fold, which is bent over their bodies 

 and secured by silken threads. As they increase in size two or more leaves 

 are fastened together so as to form a leaf case, which shelters them from 

 the weather and screens them from the prying eyes of birds. 



Promethea moth 



Callosamia promethea Drury 



A large, delicate bluish white caterpillar with four large yellow or red tubercles on 

 the posterior thoracic segments and a large one on the dorsum of the eighth abdominal 

 segment, feeds on the foliage of lilac and a number of trees and plants. 



This is another common species remarkable in its larval stage for the 

 delicate color, which so closely resembles that of the underside of a lilac 

 leaf, that the caterpillars are difficult to detect. The full grown larva is a 

 stout, bluish white caterpillar about 2^2 inches long and ornamented as 

 described above. The parent insect is one of our larger moths and can be 

 easily recognized by reference to plate 43, fig. 4. This species feeds on a 

 number of trees and shrubs, being commonly found on lilac, and occurring 

 on sassafras, wild cherry, oak, maple, birch, beech, apple, peach, plum, tulip, 

 poplar and occasionally on pine. 



Pristiphora sycophanta Walsh 



A whitish, green tinted sawfly larva on willow, white and yellow birch belongs to 

 this species. 



This sawfly was found by Dr Dyar on the leaves of white birch at 

 Keene Valley N. Y. and also on willow and yellow birch at Jefferson N. H. 



