. Injurious insects and the use of insecticides [microform] : a new descriptive manual on noxious insects, with methods for their repression . i,. Fig. 9.—Saw-flies, Natural Size. 2. COLEOPTERA, OR SHEATH-WINGED INSECTS. / This order is, by some entomologists, believed to out-number allothers, more than one hundred thousand beetles being already order is distinguished from others by insects having two pairs of. Fig. 10.—Carnivorous Waticr-bkktlks. wings, the upper ones being of a hard, horny texture wliiili form ashield for the protection of the softer wings beneath. The lower wingsa
. Injurious insects and the use of insecticides [microform] : a new descriptive manual on noxious insects, with methods for their repression . i,. Fig. 9.—Saw-flies, Natural Size. 2. COLEOPTERA, OR SHEATH-WINGED INSECTS. / This order is, by some entomologists, believed to out-number allothers, more than one hundred thousand beetles being already order is distinguished from others by insects having two pairs of. Fig. 10.—Carnivorous Waticr-bkktlks. wings, the upper ones being of a hard, horny texture wliiili form ashield for the protection of the softer wings beneath. The lower wingsalone are used in flight. Beetles are masticating insects ; they havebiting mouth-parts, and undergo complete transformations. They are ^ INSECTS, CLASSIFICATIONS, AND INSECTICIDES. 25 divided iuto True Beetles and Suout-beetles ; in the latter the head isprolonged iuto a beak or suout. Many beetles do great injury to farm crops; other carnivorousspecies are decidedly beneficial to man. The larviE of beetles are called grubs and borers. Some live in thetrunks and limbs of trees, or in the stems of plants, or feed uponfoliage, others are aquatic or semi-aquatic in habits, and still othersprey upon species injurious to vegetation.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbenefic, bookyear1894
