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. 
(Hematopinus asini 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 
thebody. Color yellowish orrust-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 2to 3.25mm. These lice infest chiefly 
the throat and neck of their hosts (fig. 71, plate VI). 
THE SHORT-NOSED CATTLE-LOUSE. 
(Hematopinus eurysternus Nitzsch). 
This common parasite of our cattle is 1.5mm. long. Its 
