. Public health and preventive medicine. hool. , Antiseptic applications. VERMES, NEMATODA. Rhabditis niellyi is a nematode worm found in the vesicle of a papulo-vesicular eruption of which it is supposed to be the medinensis (see p. 98). Pinta and piedea are epiphytic diseases of the skin and hair, confinedto tropical countries. INSECTA. Cuterebra noxialis.—This is a fly found in Central America, whichfrequents the outskirts of woods, and lays its eggs on man, cattle, and dogs, itslarvae being known as the Macaco worm. They penetrate the skin, causingmuch irritation. Ochromyia a
. Public health and preventive medicine. hool. , Antiseptic applications. VERMES, NEMATODA. Rhabditis niellyi is a nematode worm found in the vesicle of a papulo-vesicular eruption of which it is supposed to be the medinensis (see p. 98). Pinta and piedea are epiphytic diseases of the skin and hair, confinedto tropical countries. INSECTA. Cuterebra noxialis.—This is a fly found in Central America, whichfrequents the outskirts of woods, and lays its eggs on man, cattle, and dogs, itslarvae being known as the Macaco worm. They penetrate the skin, causingmuch irritation. Ochromyia anthropophaga.—This insect, found in Senegambia, laysits eggs in the sand, and the larvse bore through the human cutis, and give riseto inflammatory indurations. Gnats and mosquitoes.—The males are harmless ; the females alone bite,and may produce great irritation and even malaise. The association of mos-quitoes with malaria, yellow fever, and hlariasis is discussed elsewhere. Pulex penetrans (Jigger, chigoe, or sand flea): — a b. Fig. 39.—Pvlex penetrans (chigoe), Female,x 15 diameters. Egg, x 50 diameters. Fie 10. — Pediculus itis. a, Hair, witheggs; A. Male: c, Female, x 12 diameters. Geographical DisTRiBCTioy.—\\\^t Indies, South America, and someparts of Africa and China. Both sexes live in the blood, hut the male is relatively harmless. Theadult female (Fig. 39), however, penetrates the skin, usually that of the feet, beneath which she produces her eggs, and causes much pain and inflammation INTEGUMENTARY SYSTEM 101 and, it may be, an open sore. Dry sandy soils and the floors of dirty hutsconstitute the habitat of this justly dreaded pest, which attacks all warm-blooded animals. Prevention of Origin and Spread.—The feet should be protected. Cleanliness of houses, byres, poultry runs, etc., is essential. Insecticidesshould be used. PedicillllS (Louse).—There are three chief species, affecting respectivelythe heads, clothes, and pubic hairs of mankind. Thes
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