454 



of the acarus will identifj^ tlie disease. Treatment is the same as for 

 the sarcoptes, but may be confined to the legs and the parts with 

 which they come in contact. 



Parasite.— 2)erwa?i2/ssi<s gaUinecB — Chiclcen Acari. Malady: 

 Poultry acariasis.— 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 Avithout chloride of lime will prevent future attacks. The 

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



Parasite: Larva of a TromUdium—Leptus Americanus— Harvest 

 Bug, misnamed Jigger {Chigoe). Malady: Aidumn mange.— This 

 parasite 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, oi, dog, etc., burrowing under the skin and giv- 

 ing rise to small papules and intolerable irritation. This continues 

 for two or three days only if no fresh acari are received, but will 

 last until cold weather sets in if a fresh colony is received every day. 

 Horses at pasture suffer mainly on tlie 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: aamarus Pteropioides and Chegletaes live in musty 

 fodders and are found on the horse. 



TICKS. 



The wood tick is familiar to inhabitants of uncultivated lands, and 

 proves a troublesome parasite to man and beast alike. It lives on 

 bushes, and only attaches itself to the mammal to secure a feast of 

 blood, for when gorged it drops off to sleep off its debauch on the soil. 

 The tick produces great irritation by boring into the skin with its 

 armed proboscis. If pulled out the head and thorax are often left in 

 the skin. They may be covered with oil to shut out the air from their 

 breathing pores, or by touching them with a hot penknife they will be 

 impelled to let go. If extracted by the liand they should be turned 

 to. the left like a screw. It is needless to particularize the several 

 species, as all can be treated alike. 



GRUBS IN SKIN. 



Parasite: Hypoderma Silenns. IMalady: Larva {Gruhs) under 

 the shin.— This fly deposits its embryo on or in the skin of the horse, 



