266 INSECTS AFFECTING DOMESTIC ANIMALS. 



Lice Infesting Horses. 



Three species of lice infest the horse. The first is 

 the Sucking Horse-louse (Hxmatopinus asini) which 

 is represented, considerably magnified, at Fig. 139, a. 

 It is somewhat similar to the Sucking Ox-louse, to 

 which it is closely related, but 

 is easily distinguished from that 

 species by the shape of the 

 head. It is the rarest of the 

 three species infesting the horse, 

 the next commonest one being 

 the Rarer Biting Horse-louse 

 (Trichodectes pilosus) represented 

 at Fig. 139, b, which, as its name F %|£ £ ||?H^e- e " 

 indicates, is less abundant than 

 the third species — the Common Biting Horse-louse 

 (Trichodectes parumpilosus), which is shown at Fig. 

 137, c. This last is the most abundant and annoy- 

 ing, and is especially liable to infest colts or horses 

 that have been in pasture for some time. It occurs 

 mostly about the head, mane, and tail ; and is gen- 

 erally thickest in spring. The front part of the body 

 is brownish, and the abdomen is yellowish-white, 

 with eight transverse dark bands upon the back. 



Remedies. — The remarks concerning remedies 

 for cattle lice are equally applicable to these species. 



