PARASITOLOGY. 39 
head is crescent-shaped and scarcely as wide as long. 
The abdomen is narrow and rather ovoid in form, 
and is comprised of nine segments. The legs are 
short and are equipped with claws which aid it in. 
PPtrr sy trary 
ORD \\ 
Fig. 8—TRICHODECTES SCALARIS—magnified. 
a, Mouth Parts, c, Legs. e, Thorax. 
b, Antennae. d, Head. f, Abdomen. 
holding on to its host. A few scattering hairs ure 
noted over the head, legs and abdomen. 
TRICHODECTES SPHEROCEPHALUS (Spher—a sphere) 
(Cephala—a head). 
Animal Intested.—This louse infests sheep. 
Description.—The head is nearly as wide as long, 
the anterior part being crescent shaped. The thorax 
is narrower than the head; the abdomen is oval in 
shape and the legs are short. It is common. 
