124 



THE STUDY OF INSECTS 



pinifolice, which occurs on various species of pine wherever these trees 

 grow in the United States; Figure 199 represents the scurfy scale Chionaspis 

 furfura, which is very destructive to apples and pears; while the San Jose 

 scale, Aspidiotus pernicidsus, which is one of the most serious pests of vari- 

 ous fruit trees in this country, is shown in Figure 206. 





Fig. 206. — San Jose scale, 

 much enlarged. 



Fig. 206a, — Pseudococcus cilri, 

 a mealybug that is a pest in green- 

 houses and of orange trees in warm Fig. 200b, 

 regions. natural size. 



Lecanium hcspcridum, adult females, 



