Le royaume d'animaux : arrangé après son organisation, formant une histoire naturelle des animaux, et une introduction à l'anatomie comparée . taux, représentent les mandibles des insectes mortidés, Et que les deux) eads de la seta inférieure réponse aux maxillae (ou plutôt, comme il me semble, à leurs lobes terminaux,^^^ qui, dans les Bees et les papillons, sont transformés en filament allongé); Par conséquent, le TGU inférieur est remplacé par la gaine tubulaire du sucker, et - la pièce triangulaire à la base devient le labrum.L'onguelet, correctement appelé, existe aussi, sous une forme analogue t

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The animal kingdom : arranged after its organization, forming a natural history of animals, and an introduction to comparative anatomy . rate, represent the mandibles of the biting insects, and that the two th) eads ofthe inferior seta answer to the maxillae (or rather, as it appears to me, to their terminal lobes, ^^ which in the Bees and Butterflies are transformed into an elongated filament); hence the lower UpU is replaced by the tubular sheath of the sucker, and - the triangular piece at the base becomes the labrum.The tonguelet, properly so called, also exists, andunder a form analogous to that of the precedingpiece, but bifid at the tip (see Cicada); the palpiare the only organs which have entirely disappeared, and vestiges of them are perceived in Thrips, [which, however, are now proved to belong to an order dis-tinct from the present; palpi, small and inarticidate, >i!^ also exist in some of the Hydrocorisa;].• (^vlfj^ The mouth of the Hemiptera is, therefore, fittedonly for exti-acting by suction fluid matters: thedeUcate threads of which the sucker is formed pierce the vessels of plants and animals, and the. IIEMIPTERA. 563 nutritive fluid, successively compressed, is forced up the main canal, and arrives at the o-so-pliaijus ; tlie sheath of the sucker is often elbowed, or forms au angle. Like other suckinginsects, the Hcmiptera possess salivarj vessels. In the majority of the insects of this order the wing-covers are coriaceous, or crustaceous, with the posterior extremity membranous, and forming, as it were, a kind of supplementaljneee; they nearly always cross each other: those of other Ilemiptera are merely thicker andlarger than the hind wings, scmi-menibranons, like the wing-covers of the Orthoptcra, amisometimes opaque and coloured, sometimes transparent and veined. The wings have severallongitudinal folds. The composition of the thorax begins to exhibit the modifications which we meet with inthe following orders. Its anterior segment, hitlierto k

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