43 



ton, Kan.; Kansas City, Kirkwood and St. Louis, Mo.; Bristol, 

 Conn., and Brooklyn, N. Y. It occurs throughout the state of 

 Massachusetts. 



This species sometimes becomes very abundant and destructive 

 to some extent. Professor Johnson found it abundant on "virgin 

 timber." It confines its attacks to elms and is most often found on 

 Ulmus americana though I have taken it on Ulmus montana var. 

 camperdown pendula. The insect passes the winter in the egg stage. 

 At Amherst, Mass., the eggs hatch about the middle of May, the 

 young all making their appearance within a short time of each other. 

 Professor Johnson's observations show that the insect is two-brooded. 

 The females confine themselves to the bark of the tree and can be 

 found from the trunk to the very tips of the twigs. The males occur 

 both on the bark and on the under side of the leaves. The female 

 usually lays about seventy eggs but the number varies from a very 

 few to about eighty-five. 



Prof. Johnson bred two parasites, Perissopterus pukhellus and 

 Physcus varicornis, from the species. He has also seen the larva and 

 adult of Chilocorus bivulnerus feeding on it. 



