. Principles of economic zoo?logy. Zoology, Economic. 154 BRANCH ARTHROPODA The Wings.—As the ordinal name indicates, these insects have two membranous wings. No fly has more than two wings and only a few are wingless. They have, however, vestiges of a second pair, called halte'res or balancers, ending in short knobs. They are used in directing the flight and are be- lieved by some to be auditory organs. Family Mus'cidae.—The common house-fly (Mus'ca domes'tica) is too well known for our comfort. It hibernates. One will recall having seen flies about the house during the winter. They breed abo
. Principles of economic zoo?logy. Zoology, Economic. 154 BRANCH ARTHROPODA The Wings.—As the ordinal name indicates, these insects have two membranous wings. No fly has more than two wings and only a few are wingless. They have, however, vestiges of a second pair, called halte'res or balancers, ending in short knobs. They are used in directing the flight and are be- lieved by some to be auditory organs. Family Mus'cidae.—The common house-fly (Mus'ca domes'tica) is too well known for our comfort. It hibernates. One will recall having seen flies about the house during the winter. They breed about stables in the sum-. Fig. 124.—Typhoid fever or house-fly (Mus'ca domes'tica): a, Adult male; b, proboscis and palpus of same; c, terminal joints of antenna;; d, head of female; c, puparium; /, anterior spiracle; all enlarged. (Howard and Marlatt, Bull. U. S. Dept. of Agriculture, 1896.) nicr. The eggs, numbering about one hundred, hatch in about twenty- four hours. The soft, white, oylindric, footless larva is called a maggot. It feeds and grows for about a week, molting twice, and then pupates within the larval skin, or puparium, for another week. It then makes a circular opening in the puparium and emerges as the adult fly, thus giving time for a number of generations. In a summer the offspring of a single fly may reach incredible numbers. It is now known that the principal in- sect agent in the spread of typhoid fever is the common house-fly, and great care should be taken to prevent its breeding. All human and horse excreta should be kept in fly-tight vaults and sprinkled with chlorid of lime or quick lime at least once a week, vmless wanted for fertilizing purposes. All garbage cans and swill pails should be kept covered, and. 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 Daugherty, Lewis Sy
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