The Dipterous Genus Dolichopus Latreille in North America (Classic Reprint)
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| Hersteller: | Forgotten Books (Duzee, M. C. Van) |
| Stand: | 2015-08-04 03:50:33 |
Produktbeschreibung
Excerpt from The Dipterous Genus Dolichopus Latreille in North America The dipterous family Dolichopodidae offers such a storehouse of material bearing upon the Darwinian theory of sexual selection that its many beautiful and easily classified species ought to be much more widely known among those who give attention to the larger biological problems. In the present paper a large number of secondary sexual characters are figured, not only as aids lo identification, but to give some idea of the wealth of beautiful structures which have been developed in the males of tins genus. The species are so abundant and accessible everywhere in the United States and Canada, as well as Europe, that their peculiar mating habits ought to he recorded for many, instead of the five which arc given a few paragraphs farther on. The family is readily distinguished by a few characters. Its members have antennae with three simple joints and an arista; the tarsi with empodia not pulvilliform; palpi with only one joint; basal cells of wing very small, the second confluent with the discal, anterior cross-vein close to base of wing. The species almost universally have bright metallic green and blue colors. Among the genera of this family are two which are strikingly rich in species - Psilopus, with a widely divergent fork on the third vein, which is widespread in the tropics everywhere, and occurs also in temperate zones; and Dolichopus, recognized by having several spines on the upper side of the hind basitarsi, which has a circumpolar distribution in the northern hemisphere, extending southward pretty well across the north temperate zone. The presence of the spines just mentioned on the upper side of the hind basitarsi is a sufficient diagnostic character to separate the genus Dolicltopus from all others known in North America; it would serve equally well throughout the species of the rest of the world by adding that the arista is never plumose. The Ethiopian and oriental Rhago-neurus Loew (Lichwardtia Enderlein, 1912) has a plumose arista and a single spine on the hind basitarsus. 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.
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