198 



ZOOLOGY. 



The itch, or mange (scabies), is caused by the irrita- 

 tion which the mites continually exert on the skin. 

 The warmer the surroundings of the host, the more 

 active the mites, and the more painful the skin 



Fig. 126 — Mange Mite of the Pig (,Sarcoptes scaMei, var. suis), 

 seen from the dorsal surface, x 200. 



disease. (The scarcoptes mites, e.g., are most un- 

 endurable in man when in bed, and scabby sheep are 

 most tormented when in a warm fold.) The mites 



