HEMIPTERA. 



Suborder PARASITA (Par-a-si'ta). 



147 



The Parasita includes certain parasites of man and other 

 mammals, commonly known as lice. They are wingless, 

 and differ from other Hemiptera in having the beak fleshy 

 and not jointed. This suborder is represented in the United 

 States by only one family, the Pediculidce. 



Family PEDICULID.E (Ped-i-cu'li-dae). 

 The Lice. 



This family comprises the true lice, which differ from the 

 bird-lice of the order Mallophaga in having sucking mouth- 

 parts. The true lice live on the skin of mammals, and suck 

 their blood. 



There are three species that infest man : one living on 

 the head, among the hair ; and the other two on the body. 

 Several species infest our domestic animals. The more 



FIG. ^.Hcematopinus 

 asini. (From Law.) 



FlG. 183. H. eurysterntts. 

 (From Law.) 



common of these are the louse of the horse (Fig. 182), and 

 the louse of the cow (Fig. 183). 



Various substances are used for destroying lice on domes- 

 tic animals : among them are a strong infusion of tobacco, 



