VERMIN IN THE SKIN. 201 



Common on cattle, frequenting the mane. Also, occasion- 

 ally found upon the ass. 



Trichodectes Sphcerocephalus, (Louse of the Sheep, Fig. 201). 

 Head nearly orbicular ; clypeus rugulose, and ciliated with 

 stiff hairs ; the third joint of the antennae the longest and 

 clavate. 



Trichodectes Latus, (Louse of the Dog, Fig. 202). 



Pale fulvous ; head and thorax ferruginous-yellow, the 

 former subquadrate, with two black spots in front and two 

 diagonal fasciae from the antennae to the occiput ; abdomen 

 oval. Length, \ to f . 



Common upon dogs, more especially puppies. 



Trichodectes Subrostratus, (Louse of the Domestic Cat). 

 Clypeus elongate, triangular ; apex bituberculate. 



To the apterous insects belong also the fleas. 



THE COMMON FLEA PULEX IEEITANS. 



Little need be said of the irritation of skin induced by 

 fleas, especially amongst dogs and cats. In hot and dry 

 countries the common flea is a great source of torment to 

 man and animals. Not only are the active full-grown ani- 

 mals troublesome, but they undergo a series of metamor- 

 phoses by which they tend more and more to invade and 

 injure the skin and hairs. The female flea, larger than the 

 male, deposits about a dozen eggs, which adhere to the part 

 they are laid upon, and are of a white colour. A little worm, 

 without feet, white at first and then red, emerges from each 

 egg, it then spins a cocoon round its body, and from this 

 silky apartment the perfect flea issues in the course of time. 



The best remedy that I have used for fleas is oil of aniseed 



