расширенный поиск

Книга по требованию: Transactions of the American Entomological Society, Vol. 19 (Classic Reprint)

Товар № 11260869
Вес: 0.68 кг.
Год издания: 2015
Страниц: 428 Переплет: мягкая обложка
Товар отсутствует
Узнать о поступлении

Excerpt from Transactions of the American Entomological Society, Vol. 19

This aggregation of material has enabled me to study the limits of variation, sexual and specific, and by this means to fix with absolute certainty the species at present known.

Several important facts have been learned. The first is, that the characters heretofore used in the separation of species based on color, sculpture, and the mode of dentation of the sides of the thorax, have an extremely small value. The second is, that the form of the antennae, together with the sexual peculiarities of the male, afford the only means of specific definition.

In the four species known to me there will be observed two forms of antenna. Three species, of which ferruginea may be taken as the type, have the joints of the antennae 4-11 of nearly equal length, or, if anything, the outer joints are gradually a little longer, especially the eleventh. In albida the outer four joints are notably shorter than the four preceding joints in both sexes.

At this point it is well to observe that the females of all the species have a semicircular depression of the last ventral segment, fimbriate with moderately long hairs. The last male segment is sinuately truncate, without depression. Other sexual peculiarities exist in the posterior tibiae of the males of several species, which will be referred to in their proper place.

The thorax is always more or less angulate at the middle of the sides, and often with three small acute teeth. In a large series of any species it will be noticed that in the males there is a tendency to a simple angulation of the sides, while in the female it is more common to observe the tridenticulate form. In albida both sexes are similarly angulate, and it is rare to find one showing evidences of the tridenticulation. In all the species the thorax is densely coarsely punctured, a little less densely and with more shining surface in carinata than in the others.

The elytra are always more or less costate. At least traces of four costse may be seen on each elytron. The innermost costa is separated from the suture by three irregular rows of punctures, it is often obliterated, and even in its greatest development (carinata) does not extend more than three-fourths to apex. The second costa is separated from the first by three irregular rows of punctures, and is more constant in its distinctness, and is, when present, entire. The third costa is always short, and is observed between the posterior termination of the second and fourth costae.

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.

Эта книга будет изготовлена в соответствии с Вашим заказом по технологии Print-on-Demand компанией ООО «Книга по Требованию». Print-on-Demand - это технология печати книг по Вашему заказу на цифровом типографском оборудовании. Книга, произведенная по технологии Print-on-Demand (POD) представляет собой классическую печатную книгу с соблюдением всех стандартов качества, от офсетной бумаги и плотного картона до качественного клея, используемого при изготовлении. Черно-белая текстовая или полноцветная иллюстрированная книга (в зависимости от исходного файла, подготовленного к печати) может быть изготовлена в разных вариантах: - в мягкой обложке (Клеевое Бесшвейное Скрепление); - скрепление скобой (для книг с небольшим количеством страниц); - в твердом переплете с клееным текстовым блоком; Материалы, используемые при производстве книги: - бумага текстового блока - офсетная (белая или кремовая) 80 г/м2 - мягкая обложка - бумага мелованная 250 г/м2; - ламинация обложки - матовая или глянцевая; - твердый переплет - картон 2 мм, каптал, белые форзацы, прямой корешок - сверхпрочный полимерный клей; - каждая книга упакована в термопленку. Каждый заказ обрабатывается в индивидуальном порядке: каждой книге, напечатанной по технологии Print-on-Demand, присваивается уникальный номер.

Читать далее