114 BITING-LOUSE OF THE HORSE. 
head, so much so that their base is nearly in line with the 
front border of the h 
ead. All claws are slender. The first 
segment of the thorax is narrow, the second broader but 
shorter. The cylindri 
cal abdomen is yellow with dark bands 

Fig. 86. — Biting-louse of the horse and ass. Greatly 
enlarged. After 
across the segments. 
Giebel. 
The whole body is covered with short 
hairs. General colorbrown. Length 1.5 to2mm. (Fig. 86). 
BITING-LOUSE OF THE HORSE. 
( Trichodectes parumpilosus Piaget). 
This is a very common parasite upon our horses, especially 
upon the younger one 

Fig. 87.—Biting-louse of 
the horse. Greatly enlarged. 
Original. 
ing a regular semi-c 
back; the abdomen is 
s keptin pastures. Their presence be- 
comes decidedly manifest in stables 
towards spring, and the irritation 
caused by their presence makes the 
infested animals very restless, so that, 
in their attempts to rid themselves 
of their tormenters, they rub off all 
the hair upon infested places of their 
skins. The neck, base of tail, and 
space between the legs are particularly 
invaded. 
Though resembling both the sca- 
laris and pilosus it is readily distin- 
guished from both by good and con- 
stant characters. Its head is very 
decidedly rounded in front, form- 
ircle; the antennz are inserted well 
more slender and tapering than that 
of the scalaris, but less so than that of the pilosus. Head, 
