THE BUGS: HEM1PTERA 



35 



Scale-Insects. Some of the greatest enemies to the horti- 

 culturist are included among the scale-insects, which infest 

 nearly all kinds of fruit-trees and many shade-trees. In some 

 species the body is scale-like in form ; in others (Mytilas'pis 



FIG. 19. Scale-Insect. (After Howard, Year-book, United States 

 Department of Agriculture, 1894) 



a, female, from beneath, showing eggs protected by scale, X 24; b, female, from 

 above, X 24; c, female scale on branch, natural size; d, male scale, X 12; 

 e, male scales on twig, natural size 



porno 1 rum, Fig. 19), the female, which begins life as an active 

 insect, soon settles down, with the beak fixed in the tissues of 

 some plant, and develops a waxy scale as a secretion from the 

 skin of the back, beneath which she lies protected for the 

 remainder of her life. The male is entirely different in 



