1920] Ball: Life Cycle in Hemiptera 151 



In the Heteroptera we find a very similar condition with 

 respect to generations. All species have at least one generation 

 a year while few if any have more than two. Adult hibernation 

 is very common in this group, in fact, it is the rule in a large 

 number of families and occurs in nearly all of them. Mating is 

 very conspicuous and takes place through a considerable period, 

 thus giving a guide to the generations. The eggs in a number 

 of groups are deposited on the leaves and are easily observed. 



; The chinch bug which used to range from northern Wisconsin 

 to Texas, had two annual generations and adult hibernation 

 throughout. Its relative ,the false chinch bug, appears to have a 

 similar life cycle although a recent writer announces four genera- 

 tions. His four broods were mathematically calculated but he 

 naively noted that it was very difficult to obtain nymphs during 

 two of the periods while during the other two they were 

 abundant. 



