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. 
ffistory.—Not common. 
inimals 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. 
Synonym.—Foot-scab parasite. 
Animals Intested.—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. ; 
SyYMBIOTES COMMUNIS, variety Caprae. 
Animal Infested.—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. 
