. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING MAN AND ANIMALS 389 astonishing rapidity they are able to consume large quantities of flesh in a remarkably short time. In this way they may be of some importance as scavengers. The bot-flies, family Oestridce, are another group of flies that are a great source of annoyance, and often loss, to the stock- man. Rarely, too, the larvae of some of them may infest man. The adult flies look much like small hairy bumble-bees. The mouth-parts are rudimentary so they cannot bite, yet many animals have an
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING MAN AND ANIMALS 389 astonishing rapidity they are able to consume large quantities of flesh in a remarkably short time. In this way they may be of some importance as scavengers. The bot-flies, family Oestridce, are another group of flies that are a great source of annoyance, and often loss, to the stock- man. Rarely, too, the larvae of some of them may infest man. The adult flies look much like small hairy bumble-bees. The mouth-parts are rudimentary so they cannot bite, yet many animals have an instinctive fear of them and will do every- thing that they can to get away from the pests. The common bot-fly of the horse, Gastrophilus equi, attaches its eggs to the. FIG. 176.—Horse bot-fly, Gastrophilus equi. (Two and one-half times natural size.) hair of the legs or some other part of the body of the animal. The horse licks off the eggs into its mouth. The eggs hatch just before or after they are licked off and the larvae develop in the alimentary canal of their host. Sometimes the walls of the stomach may be almost covered with the larvae that have at- tached themselves there. This of course seriously interferes with the function of this organ. When full grown, the larvae pass from the horse with the droppings, and complete their transformations in the ground. There are two other species of bot-flies attacking the horses. These have habits similar, in most respects, to the species just 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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