. Essentials of laboratory diagnosis; designed for students and practitioners. the arachnoids and insects. Arachnoidea. Sarcoptes or Acarus Scabiei (the Itch Parasite).—Thisparasite is oval in shape, is provided with horns and bristles (seeFig. 30), and is barely visible to the naked eye. The malemeasures from to millimeter in length by to in breadth; the female is somewhat larger, showing 160 ANIMAL PARASITES. a length of to millimeter and a breadth of millimeter. The female lies at the end of a burrow in the epidermis, insituations where the
. Essentials of laboratory diagnosis; designed for students and practitioners. the arachnoids and insects. Arachnoidea. Sarcoptes or Acarus Scabiei (the Itch Parasite).—Thisparasite is oval in shape, is provided with horns and bristles (seeFig. 30), and is barely visible to the naked eye. The malemeasures from to millimeter in length by to in breadth; the female is somewhat larger, showing 160 ANIMAL PARASITES. a length of to millimeter and a breadth of millimeter. The female lies at the end of a burrow in the epidermis, insituations where the skin is most delicate, as between the fingers,at the elbows, under the knees, and in the groin. In this bur-row, which varies from a few millimeters to a centimeter inlength, the female deposits her eggs, after which she dies. Theeggs hatch in from four to eight days, and in about fourteendays the larvae are sufficiently matured to make their own bur-rows. The disease is communicated either by the clothing or bypersonal contact. To demonstrate the parasite, the burrow is. Fig. 30.—Sarcoptes Scabiei. opened with a needle and the female is pressed out on a slide,which is then covered and examined. Demodex Folliculorum.—This parasite is very small, vary-ing in length from to millimeter. It is somewhat cylin-drical, tapering to an obtuse point at the posterior end. Thisparasite has its habitat in the sebaceous follicles, especially of theface and nose. Leptus Autumnalis (Harvest Bug).—This is a minute redparasite, from to millimeter long, which has three pairsof legs, with a row of bristles upon its back and belly. It pre-vails in summer on grass and plants and attaches itself to theskin of man by its hooklets. Insecta. Hemiptera. Pediculus Capitis (Head Louse).—The male is from 1 to long; the female is to 2 millimeters long. The INSECTA. HEMIPTERA. Id color of the parasite varies somewhat with the race of its the Caucasian it i
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisheretcetc, bookyear191
