HEMIPTERA. 



135 



of wings, the hind wings being represented by a pair of club-like 

 halteres. Each of these is furnished with a bristle, which in all of 

 the species I have studied is hooked, and fits in- a pocket on the 

 wing of the same side (Fig. 120, \a\ The male in the adult state 

 has no organs for procuring food, as the mouth-parts disappear 



4*4 



FIG. i3o Asfiidiotus nerii. i, scales on leaves of acacia, natural size ; in, adult male, enlarged ; 

 scale of male, enlarged ; i, . scale of female, enlarged. (From the Author's Report for 1880.) 



during the metamorphosis of the insect, and a second pair of eyes 

 appear in their place. The adult female is always \\iiiLjcss; and the 

 body is cither scale-like or gall-like in form, or grub-like and clothed 

 with wax. The waxy covering may be in the form of 



Or plates, of a continuous 1 of a thin BCalc, bc- 



i which the insect li , 



<>ng the Coccidae are found many of the most seriou 

 horticu!' any kind of fruit is free from their attai 



tin species of scale-insects and mealy-bugs are constant ] 

 in conservatories. 'J -:h which these insects or tli 



ran^porttd long n fruit <>r h\ 



plants, has caused many species that infest cultivated plan: 

 come world-wide in distribution. 



