Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 KEY TO THE ORDERS 295 these insects is necessary. If the under side of the wing be moistened with benzine or chloroform, by means of a small camel's-hair brush, it will be noticed that the membranous portion of the wing is supported by veins or nervures. The relative positions of these veins remain fairly constant in the various families, and thus these veins afford clear and ready means of comparison. For these veins, various systems of arrangement and nomenclature are extant. The one used h
Elementary studies in insect life Elementary studies in insect life elementarystudie00hunt Year: 1902 KEY TO THE ORDERS 295 these insects is necessary. If the under side of the wing be moistened with benzine or chloroform, by means of a small camel's-hair brush, it will be noticed that the membranous portion of the wing is supported by veins or nervures. The relative positions of these veins remain fairly constant in the various families, and thus these veins afford clear and ready means of comparison. For these veins, various systems of arrangement and nomenclature are extant. The one used here was proposed by Redtenbacher, and has been modified and ex- tended by Comstock. The principal trunks of the veins bear the Roman numerals I, II, III, etc.; the branches of each of
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