40 PARASITOLOGY. 



Trichodectes Latus (Latus — broad). 



Animal hifested. — The dog. 



Descriptio7i. — The head is wider than long ; the 

 antennae and legs are short and each is composed of 

 three articles or segments; the abdomen is globular 



Fig. 9— Trichodectes Scalaris— Ovum. 



a, Ovum in Process of Segmentation, b, Hair. 



lx% inch, magnified. 



in shape. It is the host of the Cryptocyst, which is 

 the larvae of the Taenia Canina. 



Trichodectes Subrostratus. 



Animal Infested. — The cat. 



Descriptio7i . — The head is slightly longer than 

 broad, and pointed in front; the abdomen is ellip- 

 tical in shape; the legs and antennae are short, and 

 are composed of three articles each. 



LlOTHEIDAE. 



The lice of chickens belong to the family Liothei- 

 dae. The lice from birds roosting in the barn, or 



