. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 432 MOSQUITOES using their tracheal gills, but they die within a few hours if shut in water without dissolved air. Mosquito larvae, unless suspended from the surface film by means of the breathing tube, have a tendency to sink and they rise again only by an active jerking of the abdomen, using it as. Fig. 196. A, Larva of tropical house mosquito, Culex quinquefasciatus; ant., antennae; br. t., breathing tube or siphon; m. br., mouth brushes; th., thorax; 8th s., 8th abdominal segment; 9th s., 9th abdomi
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 432 MOSQUITOES using their tracheal gills, but they die within a few hours if shut in water without dissolved air. Mosquito larvae, unless suspended from the surface film by means of the breathing tube, have a tendency to sink and they rise again only by an active jerking of the abdomen, using it as. Fig. 196. A, Larva of tropical house mosquito, Culex quinquefasciatus; ant., antennae; br. t., breathing tube or siphon; m. br., mouth brushes; th., thorax; 8th s., 8th abdominal segment; 9th s., 9th abdominal segment; tr., tracheae; tr. g., tracheal gills. S, Larva of Anopheles punctipennis; note absence of breath- ing tube, and starlike groups of scales on abdominal segments; m. br., mouth brushes; br. p., breathing pore; other abbrev. as on Fig. A. X 10. (After 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 larvae of their own and other species. The larvse shed their skins four times and then 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-. New York, J. Wiley
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