5b 



PARASITOLOGY. 



Fig. 19— PsoROPTES Communis, variety Bovis. Photomicrograph. 

 1 and 2, Females. a, Head parts, 



b, Legs. c, body. 



ally becoming thin in flesh, and later emaciated. 



PsoROPTES Communis, variety Ovis (Ovis — sheep). 



History. — Widely distributed. Found in western 

 and southwestern parts of the United States ; also in 

 France, Germany, Asia, Australia and Mexico. 



Animal Infested. — This is the common scab para- 

 site of the sheep. 



Condition Produced; Symptoms. — In watching a 

 bunch of sheep that have recently become infested, 

 it will be noted that they are restless ; that they will 

 bite themselves ; that bunches of wool will become 

 loosened ; possibly some saliva will be noted at this 

 point. If the skin be examined with the aid of a 

 hand lens, or if a scraping be made with a knife 

 (care must be taken to get close to the skin), the 

 parasite will be found. Or, if the scraping be placed 

 in a clear glass bottle and the bottle set in the sun- 



