The Cicindelinae of North America as Arranged (Classic Reprint)

The Cicindelinae of North America as Arranged (Classic Reprint)

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Excerpt from The Cicindelinae of North America as Arranged

The treatment of the Subfamily Cicindelin? 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 Cicindelin? 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 Cicindel?) 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.

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