102 THE HORSE-LOUSE. 



„^ 



Fig. 70. — Hog-louse. Greatly enlarged. Original. 



The louse is sometimes very abundant upon hogs, prefer- 

 ring as a home the thighs. 



Fig. 70 shows this nasty insect. Its claw and tibial 

 tooth, which act as finger and thumb, and enable the louse 

 to walk quite well, are also shown. 



THE HORSE-LOUSE. 



{HoBiTMtoinnus asinl Linn, {macrocephalus Burm.). 



This parasite is found upon the horse and ass; it is dis- 

 tinguished by a very narrow and elongated head, and by 

 possessing a triangular indentation behind each feeler. In 

 this indentation is located the eye. The abdomen is short 

 and oval, and the segments are deeply dentated at the mar- 

 gin; the whole abdomen is but a little longer than the rest of 

 the body. Color yellowish or rust-colored; the thorax brown- 

 ish, at base of feelers a triangular black spot. Front of 

 head, claws and horny plates surrounding the spiracles are 

 dark brown. Length 2 to 3.25mm. These lice infest chiefly 

 the throat and neck ol their hosts (fig. 71, plate VI). 



THE SHORT-NOSED CATTLE-LOUSE. 



{Ilwmatopinu^ eu.rysterrnix Nitzsch). 

 This common parasite of our cattle is 1.5mm. long. Its 



