PARASTI OLOGY. 53 
imal becomes thin, even emaciated, and is a dejected 
looking creature. If a scraping be made from a 
fresh scab by aid of the knife (care being taken to 
secure the serum from between the scab and the 
skin) and this scraping be examined under the micro- 
scope, the parasites may be observed. If this scrap- 
ing be placed in a bottle and the bottle placed in the 
sun or other warm place, the parasites will leave the 
scab and will be seen as minute white specks upon 
the walls of the bottle. 
SARCOPTES SCABEI ; variety Suis (Suis—hog). 
Synonym.—Itch-mite. 
History. —Not common in the United States. 
Animal Intested.—It is the only species of the sub- 
family Sarcoptidae that infests the hog. 
Condition Produced, Symptems.—The scab para- 
sites may begin their propagation primarily at any 
point on the body, though usually they begin near 
the ears, around the eyes, on the inner side of the 
thighs, or between the forelegs. The parasites cause 
iutense itching, the animal rubs and scratches, scabs 
appear, the skin becomes thickened, and the hair 
stands erect; in later stages the hair falls out. This 
parasite has been transmitted to man and dog, where 
it produced temporary parasitism, causing intense 
itching for a few days. 
SARCOPTES SCABEI; variety ovis (Ovis—sheep). 
Synonym.—Face-scab parasite of sheep. 
History.—Rare in America. 
Condition Produced.—A scabby condition of the 
head, resembling other forms of scabies. 
