The Cicindelinae Of North America

Author : Walther Horn
Publisher :
ISBN 13 : 9781330532591
Total Pages : 34 pages
Book Rating : 4.5/5 (325 download)

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Download or read book The Cicindelinae of North America as Arranged (Classic Reprint) written by Walther Horn and published by . This book was released on 2015-07-01 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Cicindelinae of North America as Arranged The treatment of the Subfamily Cicindelinae having been completed by Dr. Walther Horn in the Genera Insectorum, it seems advisable to publish, for the use of American students, an abstract of the portions devoted to the classification of the North American genera. The entire work of Dr. Horn covers 476 pages and embraces exhaustive treatises on the anatomy and phylogeny of the Cicindelinae as an introduction to the classification of the genera of which the subfamily is composed. This introductory matter is of special interest because of the value ascribed by the author to the pubescence (particularly of the Cicindelae) as a guide in the classification of that genus. In 1899 (Deutsche Ent. Zeitschr., p.34) Dr. Horn had called attention to the parallelism existing between the pubescence and the elytral markings. In 1906 (Ib., p.336 )he emphasized his theory by suggesting that there had been an evolution from immaculate forms, in which only constant hairs occur, to forms exhibiting complex markings, accompanied by ornamental pubescence as well as constant hairs. In his last work the words maculation and ornamental pubescence are both products of concurrent evolution still more em -i phatically establish the authors grounds for his subsequent classification. The maculation being subject to such great degree of variation from climatic and other causes as to become liable to mislead if relied upon in classification, he considers the pubescence, and especially the constant hairs, which to some extent at least escape such variation, the safer guide. The recognition of the constant hairs be comes therefore of importance, and pp. 210 to 222 of Dr. Horns work are devoted to them. Usually these are "long, thin, erect and i few in number," those of the trochanters being of that kind; the orna 3 mental hairs are "short, thick, decumbent, and countless in number," those of the clypeus and pronotum affording examples. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."