. A practical treatise on diseases of the skin, for the use of students and practioners . eal stigmata andthree hairy legs on either side, the latter pro-vided with tarsal hooklets. The abdomen isdivided into seven segments, defined by blackishindentations on either side. The males arefewer and smaller than the females, and pre-sent upon the dorsum an ano-genital orificeand a large conoidal penis and testes. Thefemales are provided with ovaries, oviductswhich terminate in a vagina having a ventral Pedi^lus» .capimtii - male. .„ .. O 1 (After Kuchenmeister.) orifice, and an anal aperture in the
. A practical treatise on diseases of the skin, for the use of students and practioners . eal stigmata andthree hairy legs on either side, the latter pro-vided with tarsal hooklets. The abdomen isdivided into seven segments, defined by blackishindentations on either side. The males arefewer and smaller than the females, and pre-sent upon the dorsum an ano-genital orificeand a large conoidal penis and testes. Thefemales are provided with ovaries, oviductswhich terminate in a vagina having a ventral Pedi^lus» .capimtii - male. .„ .. O 1 (After Kuchenmeister.) orifice, and an anal aperture in the terminal abdominal segment. Coupling is performed with the male ova or nits are whitish bodies of oval contour, which areglued to the hairs by a cylindriform sheath of chitine, which com-pletely encases the circumference of each filament. They are depositedin series, as the female traverses the hair from its insertion to itsdistal extremity, so that the oldest are in general the nearest to thescalp. The young escape from the ova in from three to eight days,. 650 DISEASES OF THE SKIN. Fig. 94. and arrive at maturity in from eighteen to twenty days. A singlefemale can, according to Kaposi, lay fifty eggs in six days, and thusin eight weeks have an entire progeny of five thousand lice. Head lice usually limit their habitat to the scalp, though, rarely,in elderly men with long hair reaching to a full beard, they mayencroach upon the latter. They are found upon every portion ofthe scalp, but find the region of the greatest protection upon theocciput. They infest children and adults of both sexes, hut are bestfurnished with lodgement in the scalps of girls and women coveredby long and luxuriant hairs. The lesions observed upon a scalp thus inhabited, vary accordingto the age and vigor of the colony; and are few or numerous, discreteor confluent pustules or bulla?; surfaces excoriated by scratching andoozing with serum, pus, or blood : crusts varying in characteraccord
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Keywords: ., bookauthorhydejame, bookcentury1800, bookdecade1880, bookyear1888
