Biologia Centrali-Americana. Insecta. Lepidoptera-Rhopalocera

Biologia Centrali-Americana. Insecta. Lepidoptera-Rhopalocera

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...metasternum over the proximal end of the abdomen; the hind tibiae always have two pairs of spurs except in Pg/thonides amarg/llis, Staud., and its immediate allies. The male genitalia have, for the most part, symmetrical harpes, but in a considerable number they are asymmetrical, and many of these, perhaps, show a relationship to Thanaos, in which an extreme degree of asymmetry is shown. In the following arrangement we have been obliged to diverge considerably from the generic key elaborated by Mr. Watson. The number of forms not included by him, which have now to be considered, renders some change necessary. We are far from satisfied with the arrangement now adopted, which, treating of a limited fauna, is very imperfect. Nearly every character is subject to a graduated change from the extreme forms in which it appears, and it is only by the combination of a number of these unstable features that some natural combinations can be brought together. A formal key to the genera does not give at all satisfactory results, as strained interpretations of unstable characters almost inevitably result. We therefore have not attempted to do more than give a few leading headings as a help to distinguish the genera. We may add that the examination of male characters for the purpose of discriminating species and even genera seems to us to be of increasing importance, and the value of these characters in complicated cases like the present is, we believe, likely to be enhanced. The members of this section are distributed over the tropical and temperate portions of nearly the whole world, Tropical America possessing the larger share. a. Antennae with a short terminal hook, the bent portion not more than half the length of the swollen club. a'....
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Product details

  • Paperback | 370 pages
  • 189 x 246 x 20mm | 658g
  • United States
  • English
  • black & white illustrations
  • 1236899601
  • 9781236899606