The elements of insect anatomy The elements of insect anatomy : an outline for the use of students in entomological laboratories elementsofinsect00comst Year: 1916 K+M^^ 92 T/ie medio-cubital cross-vein.—This is a cross-vein extending from the media to the cubitus, usually near the center of the wing. It is designated by the abbreviation m-cii. When in its typical position this cross-vein extends from a point near the base of vein M^^^ to a point near the base of vein C//,. The medial cross-vein.—This is a cross-vein extending from vein J/, to vein M^ ; it is designated by the abbrevia- ti
The elements of insect anatomy The elements of insect anatomy : an outline for the use of students in entomological laboratories elementsofinsect00comst Year: 1916 K+M^^ 92 T/ie medio-cubital cross-vein.—This is a cross-vein extending from the media to the cubitus, usually near the center of the wing. It is designated by the abbreviation m-cii. When in its typical position this cross-vein extends from a point near the base of vein M^^^ to a point near the base of vein C//,. The medial cross-vein.—This is a cross-vein extending from vein J/, to vein M^ ; it is designated by the abbrevia- tion ;//. The presence or absence of this cross-vein is often a character of considerable taxonomic importance. The arculus.—In many insects there is what appears to be a cross-vein extending from the radius to the cubitus near the base of the wing. This has been termed the arculus by writers on the Odonata, and the use of this term has been extended Fig. arculus, diagrammatic. ^^ ^„ ^^.^^^^^ j^ which there is a similar arrangement of the veins in this part of the wing. The arculus is designated by the abbreviation ar. Usually when the arculus is present the media appears to arise from it. The fact is, the arculus is compound, being composed of a section of the media and a cross-vein. The structure of this part can be clearly seen in the Odonata (Fig. 4). In Ryphus (Fig. 2) the arculus appears as a simple cross-vein extending from the radius to the cubitus, and a part of the base of the media is atrophied. Designation of the cells of the wing.—The thin spaces of the wings which are bounded by the veins are called cells. In descriptions of wings it is often desirable to refer to one or more of the cells. It is necessary, therefore, to have a nomenclature of the cells of the wing, as well as of the wing- veins. Having named the wing-veins, the simplest possible method of designating the cells of the wing is to apply to
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