Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . recommended to smear thebacks of the cattle during summer with fish oil, ker-osene emulsion, or some similar substance, to pre-vent the flies from depositing eggs, but this is amuch less practical method than that of destroyingthe maggots, because the flies are present nearly allsummer, making it necessary that the applicationbe frequently renewed. Cattle Lice. There are three species of lice infesting of these belong to the group of sucking lice andthe third is one o
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . recommended to smear thebacks of the cattle during summer with fish oil, ker-osene emulsion, or some similar substance, to pre-vent the flies from depositing eggs, but this is amuch less practical method than that of destroyingthe maggots, because the flies are present nearly allsummer, making it necessary that the applicationbe frequently renewed. Cattle Lice. There are three species of lice infesting of these belong to the group of sucking lice andthe third is one of the biting lice. They are called(1) the Short-nosed Ox-louse; (2) the Long-nosedOx-louse; and (3) the Biting Ox-louse. The Short-nosed Ox-louse (Hsematopinus euryster-nus) is represented consid-erably magnified at , a. Full grown femalesof this species are one-sixthof an inch long, and themales are somewhat small-er. The beak or rostrumis provided with littlehooks by which it may be firmly attached to theskin, and within these hooks there is a slender suck-ing tube having a piercing extremity which the. Fig. 137. Lice: a, 6, suckingox-lice; c, biting horse-louse. Magnified. INJURING CATTLE. 263 insect pushes through the skin of its host, and sucksthe blood. The eggs are glued to the hairs of thecattle, and the young lice do not differ essentially inappearance from the adults, except, of course, in insects generally infest the neck and shouldersof cattle. The Long-nosed Ox-louse (Hsematopinus vituli) isrepresented magnified at Fig. 137, b. As will beseen, it differs materially in appearance from theother species, being at once distinguished by its longerand more slender body. It is about one-eighth ofan inch long, and obtains its food by suction. An idea of the form of the Biting Ox-louse (Trich-odectes scalaris) may be obtained from Fig. 137, c,which represents a closely related insect infestinghorses. This species differs also in color fromthe sucking cattl
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