. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 444 MOSQUITOES lyre-shaped design on the thorax. The female, which, of course, is the only sex connected with the transmission of disease, since the males do not suck blood, has very short palpi which are white at the tip. The wings are clear and somewhat iridescent. Habits of Aedes calopus. — The yellow fever mosquito is the most thoroughly "domesticated" species known. It is seldom found except in the vicinity of houses and shows a decided pre- ference for human blood. As a rule it seldom le
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 444 MOSQUITOES lyre-shaped design on the thorax. The female, which, of course, is the only sex connected with the transmission of disease, since the males do not suck blood, has very short palpi which are white at the tip. The wings are clear and somewhat iridescent. Habits of Aedes calopus. — The yellow fever mosquito is the most thoroughly "domesticated" species known. It is seldom found except in the vicinity of houses and shows a decided pre- ference for human blood. As a rule it seldom leaves the rooms of houses ex- cept to find a suitable place to lay its eggs. Long familiarity with man has made this mosquito one of the most elusive and well-adapted pests of the human race which nature has ever evolved. Its stealthy attack from be- hind; its habit of crawling up under the clothing to bite in preference to attack- FiG. 202. Head of Aedes ing the exposed ankles; the suppres- calojms, male. (After Gold- g^Q^ of the characteristic mosquito ^^^^^?> "song," so that its bite comes silently and without warning; its habit of concealing itself in pockets, folds, etc., of garments; its hiding behind pictures, under chairs, etc.; the wariness of its larvae; —all these are the result of lessons learned from long and close association with man. Aedes calopus is principally a diurnal mosquito, and becomes particularly hungry in the early morning and during the after- noon. It will bite in lighted rooms, but will never bite in the dark. The French Yellow Fever Commission in Rio de Janeiro stated that Aedes calopus is nocturnal. The evidence for this conclusion, which is at variance with the observations of other workers, has been shown by Howard, Dyar and Knab to be very inadequate and faulty. The danger of sleeping in an infected place, and the comparative freedom from danger enjoyed by persons who visit infected places only in the daytime, is thought to be
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
