Ecological Study of Hemiptera of Cranherry Lake Region 23 



in countless millions (Rheumatohates rileyi, Trepol)ates pictus and 

 Metrohates hesperius) scattered over miles of the surface of Cran- 

 berry Lake and the Oswegatchie River. The shore dwelling 

 species and the forms occurring in the swamps, bogs, marshes and 

 meadows present a large array while the forest species occurring 

 under bark, on the leaves and every possible part of the tree 

 make up an aggregation that cannot possibly be overlooked by 

 anyone giving the least attention to the complex association of the 

 woodland. In general the greater number may be counted as 

 plant feeders, but there are many predaceous forms that prey 



Fig. 12. — a, Pine Frog-hopper, Aphrophora parellela Say; 6, 

 (adult) and c, (nymph), Clostoptera ohtusa Say. 



upon other insects and many of course that sustain themselves on 

 decaying vegetation in such manner as to have little influence 

 on other organisms. However, no species can be considered as 

 entirely independent of the other forms in the complex association 

 of wdiich they may be only a very minor part. 



From an economic standpoint the majority of the Hemiptera 

 must be counted injurious as by far the greater number are 

 destructive to useful vegetation and especially to important forest 

 trees. This may be considered especially true of the Homoptera, 

 all the species so far as known being dependent upon growing 

 plants for their food ; none are aquatic in the true sense but several 



