. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Insects; Pests. 164 AN ECONOMIC ENTOMOLOGY. CHAPTER VI. THE COLEOPTERA OR BEETLES. The Coleoptera, "horn-winged" insects, or beetles, are dis- tinguished by the hard, horny, or tough, leathery texture of the fore wings or elytra, which meet in a straight line down the middle of the back, and are not used in flight, serving as wing- covers only. They vary greatly, and are numerous in specimens and species, over twelve thousand kinds having been described from th
. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges;. Insects; Pests. 164 AN ECONOMIC ENTOMOLOGY. CHAPTER VI. THE COLEOPTERA OR BEETLES. The Coleoptera, "horn-winged" insects, or beetles, are dis- tinguished by the hard, horny, or tough, leathery texture of the fore wings or elytra, which meet in a straight line down the middle of the back, and are not used in flight, serving as wing- covers only. They vary greatly, and are numerous in specimens and species, over twelve thousand kinds having been described from the United States and British America alone. They are as diverse in habit as in size and form, some being among the most dangerous enemies of agriculture, while others are among the most useful. It seems at first sight as if the recognition of beneficial or in- jurious forms among so many would prove a hopeless task, and yet we find it in most cases possible to say at a glance whether a given specimen is herbivorous, , plant- feeding, or carnivorous, , flesh-feeding and predaceous. All beetles are mandibulate and chew their food ; but in one series the head is more or less prolonged into a snout or beak, at the â1â-â0?==^^^n\ ^"^ *^^ which the much reduced mouth parts â V~""r^^^>7 are situated. These are the Rhynchophora, âIâ''Y'~Y'^::^^ ^'' "snout-beetles," all of which are plant- â^~"~~~^'''-*^^^^^ feeders and injurious, or likely to prove so. Tarsi in Coleoptera - yj^^ ^^^^ Cokoptcra, in which the head is a, normally nve-jointea ; _ -â h, normally four-jointed; uot prolonged into a beak, wc Can separate c, four-jointed, with the j^ ^]^g structurc of the tarsi or feet. Nor- third joint deeply lobed, â¢' from side and from above, mally there are five jomts or segments to each pair of feet; but there are many de- partures from this rule, one large series having four apparent jomts only, of which the third is lobed or deeply notch
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