6 PARASITOLOGY. 
Animal Infested.—The horse. 
Description.—The head is long and narrow. A 
deep notch is noted just back of the attachment of 
the antennae. In this notch are located the eyes. 
The abdomen is oval. A fewhairs or bristles are 
found on the head, legs and body. The legs are 
composed of four articles each, and the antennae of 
five. 
HEMATOPINUS EURYSTERNUS (Euros—broad). 
Synonym.—The broad-nosed ox-louse. 
Animal Intested.—Cattle. 
Description.—The head is short and broad; the 
thorax is wider than long, and widest at the posterior 
border. The abdom:2nis large and oval and a broad 
stripe is noted on the dorsal side of the abdomen of 
the male; on the female two black blotches are 
found on the terminal segment. This louse, like the 
preceding one, is about one-eighth of an inch long. — 
HEMATOPINUS VITULI (Vitulus—calf). 
Synonyms.—Hematopinus Tenuirostris ; the long- 
nosed ox-louse. 
Animals Infested—Cattle. 
Description.—The head is long and slender and 
somewhat sunken in the thorax. The thorax is 
longer than broad. The abdomen is also long and 
slender and the entire louse has a long and slender 
appearance. 
HEMATOPINUS Surs (Surs—hog). 
Synonyms.—Hematopinus Urius; Hematopinus Ir. 
titans. 
Animal Infested.—The hog. 
Description.—Largest species of the genus. Five 
