52 Mites Injurious to Domestic Animals. 



are interrupted in the middle area so as to form raised almost 

 scale-like sculpturings. A single pair of long hairs is present at the 

 posterior end of the body. 



Scaly-Leg in Fowls.— Scaly -leg in the domestic fowl is 



Listrophorid mite (iinde- 

 scribed genus occurring on 

 CricetoTnys gambianus), 



showing distribution of 

 tracheal tubes (p. 69). 

 (After Hirst, Journ. 

 Q u e k e 1 1 Microscopical 

 Club, Nov. 1921.) 



Fig. 35. 



Chirodiscoides caviae (p. 69), Listrophorid 



mite, parasitic on guinea-pig. Ventral view 



of male, X 268. (Original.) 



caused by Cnemidocoptes mutans. The large scales of the tarsus of 

 the feet are first affected, becoming raised at the edges by whitish 

 floury powder, which is sometimes mixed with exuded serum. In 

 advanced cases the disease assumes a characteristic form, the feet 



