The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . lum of the prothorax, and observing that, as these in-sects are essentially fliers, this piece of the prothorax is em-ployed to add strength to the mesothorax in its support ofthe upper wings. The under surface of the prothorax, (T) 1, consists of acentral piece or prosternum (antepectus K.), which is gene-rally horny, and extends in a point between the fore-legs, asis especially the case in the spring beetles {Elateridce), andtwo l
The entomologist's text book : an introduction to the natural history, structure, physiology and classification of insects, including the Crustacea and Arachnida . lum of the prothorax, and observing that, as these in-sects are essentially fliers, this piece of the prothorax is em-ployed to add strength to the mesothorax in its support ofthe upper wings. The under surface of the prothorax, (T) 1, consists of acentral piece or prosternum (antepectus K.), which is gene-rally horny, and extends in a point between the fore-legs, asis especially the case in the spring beetles {Elateridce), andtwo lateral pieces, which are very distinct in the predaceousbeetles. These are the epimera and episterna of Audouin,and sometimes the ora of Kirby and Spence. In addition tothe various horns or protuberances which arise from the pro-thorax, but which are only continuations of the externalcrust, there are several distinct appendages to be these, the legs are the most important, the basal piece ofwhich often appears to form a constituent part of the pro-sternum, but is, nevertheless, moveable; the first pair ofspiracles are also parts of the Vies. 124, ilorsal view of the thorax of a wasp; 125, lateral view of ditto, lettered as :figs. 118—123. thorax: mesothorax. 269 Moreover, in some of the longicorn beetles there is a pairof moveable spines (umbones, Kirby and Spence), arisingat the sides of the pronotum; and in lepidopterous insectsthere is a pair of scales covered with hair, quite distinct fromthe \dng-covers (tegulse), and which the same authors termpatagia, or tippets ; but which have been overlooked by allother authors except Chabrier, who first discovered them, orelse confounded (as by Burmeister, p. ]]), \Aith the truetegulae. They are described as vesicles appearing full ofliqmd and of air, and are placed at the sides of the pronotum. 2. TheMesothorax {Prothorax, Strauss-Diirckheim), T 2,upper, and (T) 2, under sm-face.—This is the second seg-men
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Keywords: ., bookau, bookcentury1800, booksubjectcrustacea, booksubjectinsects
