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A Genealogic Study of Dragon-Fly Wing Venation

A Genealogic Study of Dragon-Fly Wing Venation


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ... reduction of redun i dant cross veins, and the strengthening of the principal veins and braces seem to have been the means whereby these wings have attained their goodly measure of efficiency. Eschninse.--We come now to a group that is flourishing in our own time the world over. It contains the largest of our common dragon Fig. 25.--Wings Of Cordulegaster sapi Selys. flies, all strong-flying species, composing many genera. In the more specialized genera are many species. There is great variety in the details of the luxuriant venation of the group. Here, then, we have opportunity to apply the facts of development previously outlined to the unravelling of a bit of genealogic history. Fig. 26.--Wings Of 1'hyUopelalia apicalis Selys. The most characteristic features of the yEschnine wing are (1) the approximation of veins M1 and M brought about by the bending forward of vein M2 at the stigma, (2) the development of strong and broadly curved supplements, and (3) the elongation of the triangles in the direction of the axis of the wing. These will be seen in their best development in such genera &9Eschna and Anax (Plate XL.) Doubtless, the most generalized group within the Aeschnine series is composed of Cymatophlebia (fossil), and Gomphse-chna (Plate XXXVII, fig. 1), which have the triangle little elongated, all supplements but little developed, the anal loop small and compact, with no supplemental loop, and the anal angle of the hind wing, therefore, not greatly dilated, but which always have the stigma braced against vein Afx opposite a forward bend in vein Mv These all exhibit affinities with the preceding and the next following groups. Even the upward bend of vein M2 at the stigma is hardly more marked in Gomphasschna than in Pkyllopetalia (fig. 26)...


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Product Details
  • ISBN-13: 9781130111576
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 26
  • Spine Width: 1 mm
  • Width: 189 mm
  • ISBN-10: 1130111571
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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