Excerpt from The Journal of the Linnean Society of London, 1881, Vol. 15: Zoology These parts constitute the external casing of each thoracic segment exclusive of the appendages, viz. The wings and the legs, and of the internal process known as the entosternum. Of those on the dorsal surface the scutum is the most prominent piece, and to it, in the alary segments, the articulations of the wings are affixed. In front of it is the praescutum, forming the anterior boundary of the segment, and generally bent downwards to form ...
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Excerpt from The Journal of the Linnean Society of London, 1881, Vol. 15: Zoology These parts constitute the external casing of each thoracic segment exclusive of the appendages, viz. The wings and the legs, and of the internal process known as the entosternum. Of those on the dorsal surface the scutum is the most prominent piece, and to it, in the alary segments, the articulations of the wings are affixed. In front of it is the praescutum, forming the anterior boundary of the segment, and generally bent downwards to form the horny partitions between the segments known as the phragmata. Following the scutum is the scutellum, a prominent portion of the thoracic skeleton, to which also, in conjunction with the scutum, the membranous portions of the wings (the alulets of the Diptera and Dyticidae) are attached. Lastly, we have the postscutellum, which, like the praescutum, is generally bent downwards to form the phragma. These four pieces were regarded by Audouin? As the dorsal portions of four subsegments or annuli, of which the pectoral portions are less easily demonstrable on account of their being frequently confluent and not nearly so greatly developed. The parts forming the pectoral surface have been already suffi ciently alluded to for my present purpose in the quotation from Newport. Although I cannot indorse the whole series of rela tions thus indicated by Audouin, and typically exemplified in the structure of the Dyticidae, the general correctness of his views is evidenced to my mind by the fact that on those chief points which separated him from Macleay Burmeister I, Westwood and Newport H to which I Shall again have occasion to refer, I find the interpretation which Audouin has put upon these questions the more consonant with my own. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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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