. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING MAN AND ANIMALS 387 mouth-parts make a wound into which is injected poison from the salivary glands. Animals are driven frantic by the attacks of these pests and may even suffer death unless they are afforded some protection. Considerable losses are occasioned each year because of farmers not being able to work animals in the fields during the season that these insects are flying. The possible relation of these flies to pellagra has been referred to in the preceding chapter. The larvae of the bla
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING MAN AND ANIMALS 387 mouth-parts make a wound into which is injected poison from the salivary glands. Animals are driven frantic by the attacks of these pests and may even suffer death unless they are afforded some protection. Considerable losses are occasioned each year because of farmers not being able to work animals in the fields during the season that these insects are flying. The possible relation of these flies to pellagra has been referred to in the preceding chapter. The larvae of the black-flies are aquatic, attaching themselves to the surface of rocks in swiftly moving streams. It is difficult to fight them there, but some small streams may be cleared of their breeding places, or the water may be FIG. 174.—Screw-worm fly, Chrysomyta maccllaria. (Three times natural size.) with phinotis oil and many of the larva? destroyed without injuring the fish in the stream. Dense smudges will keep the adults away, and some protection may be afforded animals by smearing them with cotton-seed oil or oil and tar. The horse-flies, gad-flies, breeze-flies and deer-flies, all be- longing to the family Tabanida, can pierce through the toughest skin and are often a source of great annoyance to live stock. Some of them often attack man also. Cattle and horses sprayed with some crude oil emulsion are not attacked as freely as unsprayed animals. Laurel oil has recently been recommended as a fly repellent. Horn-flies, H&matobia serrata, and the stable-fly, Stomoxys calcitraus, are among the most serious pests of cattle. Means for controlling the latter have been suggested in the previous. 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 Wi
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