72 PARASITOLOGY. 



IXODIDAE. 



This family includes a group of ticks, the head 

 parts of which are slightly longer than broad. The 

 palpi are short. The head is provided with mandi- 

 bles and hypostome as in the preceding family. 



Rhipicephalus Sanguineus (Sanguis — blood.) 



Distribution. — Has been reported in Southern 

 states. 



Descriptio7i. — Resembles the Boophilus Annulatus 

 in size and shape, though the head is more prominent 

 and the palpi are short and broad, but longer than 

 the hypostome. The base of the capitulum (or head 

 parts) is broader than long, forming a projecting an- 

 gle at each side. In the male the dorsal shield is 

 red and covers nearly all of the dorsal surface. 



Animals Infested. — Cattle and other animals. This 

 tick transmits the piroplasma canis in Europe. 



Ixodes Ricinus (Ricinus — castor oil plant; eidos — like.) 



Synonym. — Castor bean tick. 



History. — Found in America, Europe and Africa. 



Description. — In shape it resembles the castor 

 bean. Its color is variegated like that of the castor 

 bean, the dorsal shield being a deep chestnut brown. 

 The mandibles are armed with teeth ; the hypostome 

 is lanceolate in shape, each half being provided with 

 six rows of denticles. The body of the male is flat, 

 oval and of a deep reddish brown, the dorsal shield 

 covering almost all of the dorsal s-urface. 



Animats hifested. — It attacks the cuticular surface 

 of the horse, ox, dog, etc. 



