PARASITOLOGY. 61 



with soap and warm water. After thoroughly soak- 

 ing the parts with water and soap the scabs may be 

 easily removed. Then apply any of the dip prepa- 

 rations. 



Symbiotes Communis, variety Bovis. 



History. — Not common. 



Animals Infested. — Cattle. 



Condition Produced. — Symbiotic scabies in the ox 

 begins around the base of the tail and rump. It is 

 slow to spread from this locality and has been known 

 to affect the animal for years, with a slow tendency 

 to spread toward the body. It is said that it does 

 not cause such intense pruritus as the sarcoptic 

 form. 



Symbiotes Communis, variety Ovis. 



Synojiym. — Foot-scab parasite. 



Aiiimals Infested. — Sheep. 



Condition Produced. — It produces scabies of the 

 feet and legs. It is slow to spread, showing a ten- 

 dency to recovery in summer, but spreading more 

 from sheep to sheep in winter. Like other scabies 

 it produces itching and the animal stamps and rubs 

 the affected parts. Symbiotic scabies most often 

 attacks the hind legs, but may spread to the fore 



limbs. 



Symbiotes Communis, variety Caprae. 



Animal hifested. — The goat. 



Condition Produced. — Attacks by preference the 

 neck and back. Yellowish, thick, hard crusts form. 

 The skin underneath the scab becomes thickened 

 and cracks are often observed. Tumefaction of the 

 lymph glands that receive the lymph from these parts 

 has been noted. The hair becomes matted and falls 

 out, exposing the scabby area. 



