. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 432 MOSQUITOES using their tracheal gills, but the}' die within a few hours if shut in water without dissolved air. Mosquito larv*, unless suspended from the surface film by means of the breathing tube, have a tendency to sink and the}-- rise again only l)y an active jerking of the abdomen, using it as . Fig. 196. A, Larva of tropical house mosquito, Culex quinquefasdatus; ant., antennae; br. t., brcathin};; tube or .siphon; ni. br., mouth Ijrushos; th., thorax; 8th .s., 8th abdominal .sot^ment; '.)
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 432 MOSQUITOES using their tracheal gills, but the}' die within a few hours if shut in water without dissolved air. Mosquito larv*, unless suspended from the surface film by means of the breathing tube, have a tendency to sink and the}-- rise again only l)y an active jerking of the abdomen, using it as . Fig. 196. A, Larva of tropical house mosquito, Culex quinquefasdatus; ant., antennae; br. t., brcathin};; tube or .siphon; ni. br., mouth Ijrushos; th., thorax; 8th .s., 8th abdominal .sot^ment; '.)th s., 9th abdominal sefiment; tr., trafhcas tr. g., tracheal gills. B, Larva of Anopheles punclipennis; note absence of brcatli- ing tube, and starliko groups of scales on abdominal segments; m. br., mouth brushes; br. p., breathing pore; other abbrev. as on Fig. A. X 10. (.\fter Howard, Dyar and Knab.) a sculling organ. Some species are habitual bottom feeders, others feed at the surface; some live on microscopic organisms, others on dead organic matter, and still others attack and devour other aquatic animals, including young mosquito larva? of their own and other sp(>cies. The larva? shed their skins four times and tlien go into 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 resemble the original Chandler, Asa Crawford, 1891-1958. New York J. Wiley [etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
