Structure and classification of insects . The licinelytra are the wing covers of such insects aswe ordinarily denominate bugs; they are half horny andhalf membranous. While these three :ire merely wing-covers, those deli-cate membranous organs that serve exclusively the pur-poses of flight, may alone properly be called will for a moment turn our attention to the composition or structure of these. The wings of insects, as we have intimated before,consii^t of the breathing tubes, everted from the body,and covered over with a thin membrane, which in somekinds is plain, and in others deck
Structure and classification of insects . The licinelytra are the wing covers of such insects aswe ordinarily denominate bugs; they are half horny andhalf membranous. While these three :ire merely wing-covers, those deli-cate membranous organs that serve exclusively the pur-poses of flight, may alone properly be called will for a moment turn our attention to the composition or structure of these. The wings of insects, as we have intimated before,consii^t of the breathing tubes, everted from the body,and covered over with a thin membrane, which in somekinds is plain, and in others decked with hairs, scales,hooks, &G. Tile lirger of tlicse tubes are called the veins^ andtheir branches the vei)dets^ or often they are termed thelines of iieuration^ or nervures. THE TUORAX OK TKt-NK. /).>. HOOIvS ON IHE 150RDERS OF THE WINGS OF IXSECTS (SPHE-CODES). The spaces between the Acins and veinlet8 are calledcells. The number and situation of these veins and theirbranches are ot great importance in determining generaand species. Many insects liave their wings divided into threeparts by the of these veins, i. <?., the costal,or upper eer <xn^central part of tlio wing— the largest of the three, and,in the grasshuppcr and cricket, sometimes modified toform a musical organ ; and the internal area, which isplaced between the otl;cr two, and is the smallest, andleast distinctly marked of the three.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectinsects, bookyear1872
