Mites Injurious to Domestic A nimals. 5 i 



Notoedrus muris, Megnin, 1880. 



(Fig. 12.) 



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

 brown rat, giving rise to characteristic crusts arid 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 Cnemidocoptes, Fiirstenberg, 1870. 

 Without any distinct spines or scales on the dorsal surface, 



FIG. 33. 

 Epidermoptes bilobatus (p. 65), <j , 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 unsegmented peduncle 

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



Cnemidocoptes mutans, Robin and Lanquetin, 1859. 



(Figs. 13 and 14.) 



This mite differs from the allied species, C. gallinae, by the 

 arrangement of the linear markings on the dorsal surface, which 



E 2 



