HOMOPTERA 



451 



Fig. 527. — Pseudococcus cilri. 



Fig. 526. — Pseudococcus 

 longispinosus. 



novcie mealy-bugs because their bodies are covered with a fine granular 



excretion, appearing as if they 



had been dusted with flour. 



The females are active nearly 



throughout their entire life. 



The males make a cocoon 



early in their nymphal life in 



which they remain till they 



emerge as adults. 



Figure 526 represents 

 Pseudococcus longispinosus, a 

 common species in greenhouses ; 

 and Figure 527, Pseudococcus 

 citri, another species that is 

 found in greenhouses in the 

 North. The latter species is 

 also a well-known pest of 

 orange trees in the South. 



Several species of mealy- 

 bugs of the genus Riper sia are 

 found in the nests of ants of 

 the genus Lasius. 



Subfamily LECANIIN^ 



The Tortoise-Scales 



The tortoise-scales are so ^ 



named on account of the form pig_ ^28.— Lecanium hesperidum, adult fe- 

 of the body in many species. males, nattiral size. 



