. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. STRUCTURE 427 lying in a groove in the fleshy lower lip, which was the only part visible before dissection. In the female mosquito there are six of these needle-like organs the nature and names of which are shown in Fig. 191. The " labrum-epipharynx " and " hypo- pharynx " act together to form a tube for drawing up blood into the mouth. A tin}' tube runs down through the hypopharynx, opening at its tip, through which saliva is poured into the wound as through a hypodermic needle to p
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. STRUCTURE 427 lying in a groove in the fleshy lower lip, which was the only part visible before dissection. In the female mosquito there are six of these needle-like organs the nature and names of which are shown in Fig. 191. The " labrum-epipharynx " and " hypo- pharynx " act together to form a tube for drawing up blood into the mouth. A tin}' tube runs down through the hypopharynx, opening at its tip, through which saliva is poured into the wound as through a hypodermic needle to prevent blood from coagu- lating. The ensheathing lower lip does not itself penetrate the wound, but bows back as the mosquito bites, the flexible tip or labr. ep. -. ' palp.'' Fig. 191. Side view of head of female Anopheles showing mouthparts; ant., antennae; clyp., clypeus; ceph. s., cephalic scales; hyp., hypopharynx; lab., labium; label., labellum; labr. ep., labrum-epipharj^nx; mand.; mandibles; max., maxillae; palp., maxillary palpi. X 20. (After Nuttall and Shipley.) " labella " acting as a guide for the piercing organs as they are sunk into the flesh. In male mosquitoes the piercing organs are much degenerated, only the suctorial part of the apparatus being well developed. Besides the variations of the parts mentioned already, mos- quitoes vary as regards the form, distribution, color and other characteristics of the scales which clothe much of the body and the edges and veins of the wings; the details of the male reproductive organs at the tip of the abdomen; the relative length of parts of the leg; and in other respects. All mosquitoes have good " capacity " as far as the digestive tract is concerned, having three food reservoirs connected with the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly rese
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
