Mites Injurious to Domestic Animals. 85 



slightly shorter and with the capitulum rather wider. Spinule on 

 capitulum as in D. canis. 



Probably this form is a common parasite of sheep, but appa- 

 rently it does not usually give rise to disease. 



Dr. W. Klein has described, however, a serious form of demo- 

 dectic mange occurring in sheep in Germany. Two large flocks were 

 affected, nearly every sheep in one flock of six hundred seemed to 

 be suffering from the complaint, the fleece being torn and missing 



FIG. 73. 

 Raillietia auris (p. 91). Ventral view of female, X 47. (Original.) 



or hanging loose in places.. In advanced cases the animals were 

 in moderate condition as regards nourishment, the wool had disap- 

 peared from the flanks, back, neck, and sides of the body, and the 

 skin became hard as a board, thickened, and strongly wrinkled in 

 the region of the neck. In the badly affected cases pruritus was 

 intense. A slender form of Demodex, very similar to that of the 

 dog, was present in numbers in these sheep. 



Judging by the symptoms given by Klein one would imagine 



