CHAP. XX. SCALE-INSECTS. 137 



eight-jointed in the adult ; the male larva has seven-jointed 

 antennae ; the tarsi are furnished with four digitules, and the 

 anal ring with six hairs. Examples The Mealy-bug with 

 long threads (Fig. 323), and the Destructive Meal-bug (Fig. 

 324). 



Fig. 323. 



Ik 



Fig. 324 



Genus PSEUDOCOCCUS (Westwood). 



This genus closely resembles Dactylopius, nearly all char- 

 acteristics being identical. In the adult female, however, the 

 antenna? are nine-jointed, those of the female larva six-jointed, 

 and the antennae of the male larva have seven joints. The 

 tarsi are not provided with the long digitules, except in 

 Pseudococcus hederae. 



Genus Coccus. 



The species of this genus may be distinguished from Dacty- 

 lopius and Pseudococcus by the following characters : 



The antennae are seven-jointed in the adult female, six- 

 jointed in the female larva, and five-jointed in the male larva. 

 The legs are very slender ; the anal ring are destitute of hairs ; 

 the eyes are smooth, and there are two ocelli. Example The 

 Cochineal Insect. 

 10 



