36 PARASITOLOGY. 



Animal hifested. — The horse. 



Descriptio7i. — 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 few hairs 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) . 



Sy7i07iym. — The broad-nosed ox-louse. 



Animal hifested. — Cattle. 



Description. — The head is short and broad ; the 

 thorax is wider than long, and widest at the posterior 

 border. The abdominis 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). 



Syno7tyms, — Hematopinus Tenuirostris ; the long- 

 nosed ox-louse. 



Ani77ials hifested — Cattle. 



Desc7'iptio7i. — 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 Suis (Suis — hog). 

 Sy7io7iy77is. — Hematopinus Urius ; Hematopinus Ir- 

 ritans. 



A7iimal hifested. — The hog. 



Description. — Largest species of the genus. Five 



