Mites Injurious to Domestic Animals. 19 



suffering from scab are restless and rub themselves against posts, 

 trees, fences, etc. The disease may be spread through healthy 

 sheep rubbing themselves against places infected in this manner, 

 or through actual contact with diseased sheep. This malady is 



FIG. 5. 



Dorsal view of male of Psoroptes communis, var. ovis, x 102. 

 (Original.) 



very contagious. The Psoroptes is sometimes found in the ears of 

 sheep, without occurring on the body, and this source of infection 

 should be borne in mind and the ears examined and treated if 

 necessary. 



Well-fed sheep are much more resistant to this disease than 



c 2 



