PARASITOLOGY. 33 
solution of creolin. Creolin may prove fatal to cats. 
Tobacco dust or pyrethrum may be dusted in infested 
quarters, 
Putex Avium (Avis—bird). 
Synonynt.—Bird flea. 
History —Found in central and western United 
States. 
Description —The head is rounded, and is not pro- 
vided with spines on the lower border, but a row of 
minute bristles is found on the side. The mandibles 
are short. 
-lnimals Infested —The attack is made principally 
upon small birds. 
THE LICE. 
PHTHIRIASIS (Lousiness)—(Louse). 
Phthiriasis is the condition of an animal or bird 
infested with lice. The lice infesting the domestic 
animals are divided into three families, viz.: Pedicu- 
lidae, Philopteridae and Liotheidae. 
Under the first is placed the genus Hematopinus. 
Under the second is placed the genus Trichodectes. 
Those species of lice belonging to the genus Hem- 
atopinus are provided with a piercing apparatus 
which projects anteriorly from the head. They live 
upon the blood of the host. 
Those species belonging to the genus Trichodec- 
tes are provided with mouth parts arranged on the 
under part of the head. They live by mastication 
from epidermis and hair of the host. 
The lice are oviparous; the eggs are called nits 
and are cemented to the hair. The eggs are oval in 
shape and white in color. 
Symptoms.—Infested horses and cattle are noted 
to rub against fences and posts, corners of buildings, 
