. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 524 FLY MAGGOTS AND MYIASIS and mostly without any serious consequences," Banks gives the following quotation from Walsh, — " Taking everything into con- sideration, we doubt whether, out of 10,000 cases where the larvse of two-winged flies have existed in considerable numbers in the human intestines, more than one single case has been recorded in print by competent entomological authority for the edification of the world." Botflies. — There are some flies of the botfly family, (Estridce,
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. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 524 FLY MAGGOTS AND MYIASIS and mostly without any serious consequences, " Banks gives the following quotation from Walsh, — " Taking everything into con- sideration, we doubt whether, out of 10, 000 cases where the larvse of two-winged flies have existed in considerable numbers in the human intestines, more than one single case has been recorded in print by competent entomological authority for the edification of the world." Botflies. — There are some flies of the botfly family, (Estridce, which as larvae habitually parasitize the digestive tracts of horses and other domesticated animals, and are especially adapted in habits and structure for such a larval life. They occasionally, though rarely, occur in man. The horse botfly, Gastrophilus equi, for instance, lays its eggs (Fig. 252) on the hairs of horses in spots where they are likely to be licked. The moisture and rubbing of the horse's tongue cause the eggs to hatch at once, and the new larvae, adhering to the tongue, make their way to the stomach and intestine where they attach themselves and develop to full-grown spiny larvae, three-quarters of an inch in length. In the following spring the larvae let go their hold, pass out with the faeces of their host and pupate in the ground. Obviously it could be only by a series of unusual cir- cumstances that these larvae could gain access to the human stomach, yet a number of cases have been recorded. — A much more common occurrence in man is infection of the intestine with larvae of various species of house- frequenting flies, especially the lesser housefly, Fannia canicu- laris, and the latrine fly, F. scalaris. The former species is very common in houses both in Europe and America. It closely resembles the housefly but is smaller, and appears earlier in the spring. The peculiar manner of flight, a sudden dart followed by a hovering, is very characteristic