HEMIPTEKA 



103 



The scurfy bark louse, 

 with a scale twice as 

 long as wide, impover- 

 ishes the apple trees in 

 some localities. The 

 rose scale (Diaspis 

 rosce) is an enemy 

 of the roses and 

 blackberries, but it is 

 kept in check by para- 

 sites. 



The armored scales 

 are represented by 

 the maple scale and the 

 poplar or tulip tree scale. 

 The covering of the in- 

 sect is not a true scale, 

 but a waxy secretion. 

 The common hothouse 

 mealy bug is also a fa- 

 miliar species of the 

 CoccidaB. The only 

 useful member of this 

 large family is the 

 cochineal insect (Coccus 

 cacti) feeding on the 

 cactus in Mexico, Cen- 

 tral America, and other 

 tropical regions. These 

 creatures are dried and 

 powdered to form the 



FIG. 113. Rose scale. Large round ones are 

 females and the few small elongate ones are 

 males. .Enlarged thrfce times. 



