106 ‘THE DOG-LOUSE. 
sheep confined in the same pen. The effect of the presence of 
such multitudes of irritating lice was plainly seen by the 
poor condition of the sheep, and by its restlessness. The 
illustrations (figs. 75 and 76) show both sexes, and one of 
the eggs. The entire skin of this louse is beautifully 
chagreened, as indicated in the illustration. 
THE DOG-LOUSE. 
(Hematopinus piliferus Burm.). 
This extremely troublesome louse seems to defy all at- 
tempts to dislodge it from its host, the dog; at all events it 
is no easy matter to free dogs once 
infested by these unpleasant guests. 
The louse is about 2mm. long with 
a six-sided head and thick feelers. 
The thorax shows divisions into seg- 
ments and is trapezoidal in shape. 
; The large abdomen has segments not 
~ strongly marked. The underside of 
the parasite is closely covered with 
hairs and minute eminences, which 
are fewer in numbers upon the dorsal 
surface. Legs are about equal in 
Fig.77~Dog-louse Great. Jength and thickness. © Headigand 
ay clare. (Aetna: thorax yellow or brownish-yellow, 
abdomen yellowish-brown or light yellow. Fig. 77. 
The skin of this louse is quite transparent, so that the 
food consumed can be detected in the intestines. 
REMEDIES.—AII lice infesting our domesticated animals 
should be removed as soon as detected, as animals harbor- 
ing such blood-sucking and irritating guests become restless 
and weak. There are many remedies that can be used. 
White precipitate or ammoniated chloride of mercury, used 
as an ointment and well rubbed in, is an excellent remedy 
for this purpose. Being very poisonous, the dog has to be 
muzzled, and the substance has to be washed off with soap 
and water after a few days or when no longer required. A 
very weak solution of nitric acid is stated to be also a good 
liquid remedy. 

