. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. NATURAL ENEMIES 461 found very efficient as a destroyer of mosquito larva) and has been extensively introduced into various parts of the tropics from its home in Barbados and other West Indian Islands. Except where other fish are present to prey upon it, this tiny. Fig. 208. Some good natural enemies of mosquitoes; A, common killifish, Fundulus heteroclitus, of great value in brackish marshes; B, fresh-water killifish, Fundidus diapftanus, valuable in fresh-water streams and ponds. | nat. size. (.\fter
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. NATURAL ENEMIES 461 found very efficient as a destroyer of mosquito larva) and has been extensively introduced into various parts of the tropics from its home in Barbados and other West Indian Islands. Except where other fish are present to prey upon it, this tiny. Fig. 208. Some good natural enemies of mosquitoes; A, common killifish, Fundulus heteroclitus, of great value in brackish marshes; B, fresh-water killifish, Fundidus diapftanus, valuable in fresh-water streams and ponds. | nat. size. (.\fter Jordan and Evermann.) fish usually thrives wherever introduced, and carries with it a noticeable diminution in mosquitoes. Other species of the same family occur in various parts of the world and are almost in- variably deadly enemies of mosquito larvae. Other natural enemies of the larvse besides fish might well be encouraged in ponds or reservoirs. The western newt or water- dog, Notophthalnius (or Diemyctylus) torosiis, which is abundant all along the Pacific Coast of the United States, has been observed to feed very largely on larvse. In Oregon the author has ob- served grassy pools, which were otherwise ideal breeding places for mosquitoes but which contained numerous water-dogs, ab- solutely free of larvse, whereas other pools not a quarter of a mile distant in which no newts were found were swarming with larvse and pupae. Recent experiments by the author, not yet published, have demonstrated conclusively that this salamander can be utihzed successfully to keep mosquito larvse out of such receptacles as rain barrels, troughs, 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
