Mites Injurio7is to Domestic Animals. 51 



Notoedrvs muris, Megnin, 1880. 

 (Fig. 12.) 

 This mite especially afiects the ears of its host, the common 

 brown rat, giving rise to characteristic crusts and warty excrescences. 

 Later the face, feet, tail, and genital region may become infected. 

 When neglected, the disease sometimes terminates fatally. Both 

 tame and wild rats suffer from this disease. 



Genus Gnemidoco-ptes, Fiirstenberg, 1870. 

 Without any distinct spines or scales on the dorsal surface, 



Fig. 33. 

 Epidermoptes hilobatus (p. 65), S , from below, X 300. (After Neumann.) 



only a few hairs being present. Both the third and fourth legs 



of the male end in a sucker, borne on an tmsegmented peduncle 



{whereas only the fourth leg has a sucker in Sarcoptes and Notoedrus). 



Cnemidocoptes mutans, Eobin and Lanquetin, 1859. 



(Figs. 13 and 14.) 



This mite difiers from the allied species, C gaUinae, by the 



arrangement of the linear markings on the dorsal surface, which 



