452 BUKKAU OF ANIMAL INDUSTRY. 



more ihorouj^h, as the Pmropt&s will survive twenty to thirt}' days in 

 the moi.st atmosphere of a stable, and may even revive after six or 

 eight weeks when subjected to moist warmth. Infested pastures will 

 therefore prove dangerous to horses for that length of time, and, with 

 rubbing posts, etc., should be secluded. 



Faeasite: CJioriojytes hovis {Symhiotes cqui, Dermatopliagxis equl, 

 Clwriojptes spathiferus). Malady: Foot mange. — This acarus attacks 

 the heels and lower parts of the legs, especially the hind ones, and may 

 be present for years without extending upon the bod3^ Like the 

 Psoroptes^ it lives on the surface, on the hairs, and among the scabs. 

 It gives rise to great itching, stamping, rubbing of the one leg with 

 the other, and the formation of papules, wounds, ulcerous sores, and 

 scabs. The intense itching will always suggest this parasite, and the 

 discover}^ of the acarus will identify the disease. The treatment is the 

 same as for the Sarcojptes, but may be confined to the legs and the parts 

 with which the}^ come in contact. 



Parasite: Dermanyssus gaUinse,, or chlcl'en acarl. Malady: 

 Poultry acarlasis. — This is a large-sized acarus, though usually mis- 

 called "hen louse," and the disease "poultry-lousiness.'' The mite 

 lives in the hen manure and adjacent woodwork, but temporarily 

 passes on to the skin of man and of the horse and other quadrupeds, 

 when occasion serves. It causes much irritation, with the eruption 

 of papules or vesicles and the formation of sores and scabs. The 

 examination of the skin is usually fruitless, as the attacks are mostly 

 made at night and the effects only may be seen during the day. 

 The proximity of hen manure swarming with the acari explains the 

 trouble, and the removal of this and a whitewashing with quicklime, 

 with or without chloride of lime, will prevent future attacks. The 

 skin may .still require bland ointments or lotions, as for congestion. 



Parasite: Larva of a Tromhidium, Leptiis americatms^ or harvest 

 hug, nnisnariied jigger {cldgoe). Malady: Autxunn mange.— Ti^x^ para- 

 site is a brick-red acarus, visible to the naked eye on a dark ground, 

 and living on green vegetation in many localities. It attacks man, and 

 the horse, ox, dog, etc., burrowing under the skin and giving rise to 

 small papules and intolerable irritation. This continues for two or 

 three daj's only if no fresh acari are received, but will last until cold 

 weather sets in if a fresh colon}^ is received every day. Horses at 

 pasture suffer mainl}'^ on the lower part of the face. If kept indoors 

 the disease will disappear, or if left at pasture a weak tar- water or 

 solution of tobacco may be applied to the face. 



Parasites: Ganiainis pteroptoides &ndi Cheyletus live in musty fod- 

 ders and are found on the horse. 



ticks. 



The wood ticks are familiar to inhabitants of uncultivated lands, and 

 prove troublesome parasites to man and beast alike. The tick lives on 



