. Circular. Insects. Fig. S.—Mnscina stahulans, enlarged (author's illustration). become more abundant of later years. It breeds in the dust under carpets, and its larva is a white, very slender, almost thread-like creature. In the autumn, when fruit appears on the sideboard, many specimens of a small fruit-fry (Drosophila ampelophila Loew) (fig. 7) make their appearance, attracted by the odor of overripe fruit. A small, slender fly is not infrequently seen in houses, especially upon window panes. This is Sepsis violacea Meig., shown enlarged in figure 8. All of these species, however, are gre
. Circular. Insects. Fig. S.—Mnscina stahulans, enlarged (author's illustration). become more abundant of later years. It breeds in the dust under carpets, and its larva is a white, very slender, almost thread-like creature. In the autumn, when fruit appears on the sideboard, many specimens of a small fruit-fry (Drosophila ampelophila Loew) (fig. 7) make their appearance, attracted by the odor of overripe fruit. A small, slender fly is not infrequently seen in houses, especially upon window panes. This is Sepsis violacea Meig., shown enlarged in figure 8. All of these species, however, are greatly dwarfed in numbers by the com- mon house fly. In 1900 the writer made collections of the flies in dining rooms in different parts of the country, and out of a total of 23,087 flies 22,808 were Musca do- m e s tied, that is, per cent of the whole number captured. The remainder, consisting of per cent of the whole, comprised various species, including those mentioned above. LIFE HISTORY OF THE TRUE HOUSE FLY. Musca domestica commonly lays its eggs upon horse manure. This substance seems to be its favorite larval food. It will ovi- posit on cow ma- nure, but we have not been able to rear it in this substance. It will also breed in human excrement, and from this habit it becomes very dangerous to the health of human beings, canying, as it does, the germs of intestinal dis- eases such as typhoid fever and cholera from excreta to food supplies. It will also lay its eggs upon other decaying vegetable and animal material, but of the flies that infest dwelling houses, both in cities and on farms, a vast proportion comes from horse manure. At Salem, Mass., Packard states that he bred a generation in four- teen days in horse manure. The duration of the egg state was twenty- FlG. i.—Phormia terrcenovce, enlarged (author's illustration).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
