. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AND DISEASE 383 for rasping and reducing to a liquid or semiliquid condition the material upon which it feeds. The mouth parts of the stable-fly, on the contrary, form a strong piercing beak which can cut through even the toughest skin in order that the fly may suck the blood of its victim. Persons are often bitten by flies that they believe to be house-flies. But house-flies cannot bite, and it will usually be found that the culprits are stable-. FIG. 170.—Stable-fly, Stomoxys calcitrans. Resembles house-
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AND DISEASE 383 for rasping and reducing to a liquid or semiliquid condition the material upon which it feeds. The mouth parts of the stable-fly, on the contrary, form a strong piercing beak which can cut through even the toughest skin in order that the fly may suck the blood of its victim. Persons are often bitten by flies that they believe to be house-flies. But house-flies cannot bite, and it will usually be found that the culprits are stable-. FIG. 170.—Stable-fly, Stomoxys calcitrans. Resembles house-fly in general appearance, but has pointed, piercing and sucking beak, and the vein which terminates near the tip of the wing is not so sharply angulated as in the house-fly. (See Fig. 166.) (Five times natural size.) flies. If the wings of a house-fly and a stable-fly be carefully compared it will be seen that the fifth vein (counting from the front margin) of the house-fly's wing is bent forward at a con- siderable angle while the corresponding vein in the wing of the stable-fly is only slightly curved. The fourth and fifth veins are the two veins that end near the tip of the wing. In the house-fly the tips of these veins are very close together; in the stable-fly they are rather widely 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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