PARASITOLOGY. 35 



herd by means of a sprinkling can or spray-gun will 

 be found to be very effective treatment. The emul- 

 sion is made as follows : 



I^ Kerosene gal. ii 



Common soap 5viii 



Water gal.i 



M. Sig.— Dissolve the soap in boiling water ; add 

 this solution boiling hot to the kerosene, stirring the 

 mixture for ten minutes. 



When used this emulsion is usually diluted as fol- 

 lows : One part emulsion to nine parts water: 



Hematopinus (Hema — blood, pinein, to drink). 



The species belonging to this genus are blood- 

 suckers, and are much larger than the biting lice. 

 They are bluish in color. The head, thorax and 

 abdomen are distinct. The head is provided with a 

 rostrum which projects anteriorly. It is arranged 

 for piercing the skin and sucking blood. There are 

 two simple eyes and two antennae (feelers). Each 

 antennae is composed of four or five articles, or seg- 

 ments. The thorax is wider than the head, and is 

 provided with three pair of legs. The legs are 

 short and strong, and the terminal segments are pro- 

 vided with one or two booklets. By means of these 

 booklets the louse is enabled to creep, and to hold 

 on to its host. The abdomen is large and is usually 

 composed of nine segments. The female is larger 

 than the male. 



The following are the common species of blood- 

 sucking lice : 



Hematopinus Asini (Asinus — assj. 

 Sy7i07iyni. — Hematopinus Macrocephalus. 



