128 NATURAL HISTORY OF INSECTS. 



SUB-FAMILY III. (Coccinss). These insects generally retain 

 the power of locomotion from the time they are hatched until 

 they die; some species, however, are destitute of legs, and are 

 enclosed in a felt-like sac. 



SUB-FAMILY I. (Diaspinas.) 



The following table will serve as a guide in ascertaining the 

 genus to which any species of this Sub-family belongs: 

 A. Scale of female circular, with the exuviae either central or 



near the margin. 



B. Scale of male but little elongated, with the exuviae more 

 or less central; scale usually resembling that of the 

 female in color and texture, - - ASPIDIOTUS. 



BB. Scale of male elongated, with the exuviae at one ex- 

 tremity. 



C. Scale of male, white and carinated, - DIASPIS. 



CC. Scale of male not white, and* with no central 



carina, PARLATORIA. 



AA. Scale of female elongated, with the exuviae at one 



extremity. 

 D. Exuviae small. 



E. Scale of male, white and carinated, - CHIONASPIS. 

 EE. Scale of male similar in form to that of the female, 



MYTILASPIS. 

 DD. Exuviae large. 



F. Scale of female with two moulted skins visible. 



PARLATORIA. 



FF. Scale of female with second moulted skin covered 

 by a secretion UHLERIA. 



f- 



Genus ASPIDIOTUS (Bouche). 



This genus includes species in which the scale of the female 

 is circular, or nearly so, with the exuviae at or near the center; 

 the scale of the male is somewhat elongated, with the larval 

 skin either at one side of the center, or near one extremity; 

 in color and texture it resembles the scale of the female. The" 



