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Show 18 LN~ECTA. In othe1• Act·ydia, also winged and with filiform antennre, the su. perior portion of the thorax is very elevated, strongly compressed, and forms an acute crest rounded and prolonged posteriorly. Certain species for·eign to Eu1·ope are very large. The south. of Europe pro· duces one that is smaller, the .!J.crydium armatttm, Ftsch., Entomog. Imp. Russ., I, Orthop .• I, 1. In the others, G. pedester-Giornm, Charpent.-one at least of the two sexes has elytra and very short wings, not at all adapted for flight. They form my new genus PonrsMA. . . Those Acrydia in which the extremity of the antennre 1~ mflated in the fot·m of a button, either in one sex or both, constttute the genus GoMPIIOOERus, Thunb. Such is the .fl. sibiricus; G. sibirictta, Fab.; Panz., Faun. Insect. Germ., XXIII, 20. Anterior tibire of the males strongly inflated and clavate. Found in Siberia and St Gothard. In the second division of the genus of the Acrydia the prresternum receives a portion of the under part of the head into a cavity; the ligula is quadrifid; the tarsi have no pellet between their hooks. The antennre are composed of but thirteen or fourteen joints. The thorax is prolonged posteriorly in the form of a large scutel· lum, sometimes longer than the body, and the elytra are very small. These Orthoptera form the genus TETRIX, Lat.-.llcrydium( 1 ), Fab.-partim Gryllus-bulla, Lin. It consists of very small species. lb., 8;-G.lineatu8, lb., 9; and see De Geer,-Santerellesde p0.9sage, pl. i-xiii, with the exception of the figures quoted under Truxalis;-Olivier-article Criquet of the Encyc. M6thod.; and the other authors quoted by Fabricius, under his genw Gryllua, such as Schadfer, Herbst., Drury, Ra::s., &c. See also Lat., Gen. Crust et Insect., III, p. 104. These references, however, are only applicable to the genus .O.crydium as originally established, or with the subtraction of those here indicated, and which may be considered simple divisions. (1) .llcrydium subulatum, l''ab.; De Geer; Scbreff'., Icon. Insect., cliv, 9, 10, clxi, 2, 3;-.11.. bipunctatum, Panz;, lb. V, 18, var.;-.9.. 8cutellatum, De Geer, ~r. Insect., Ill, xxiii, 15. See also Herbst., Archiv. Insect., lii, 1-5. I ' HEM I PTE IL\ . 19 ORDER VII. HEMIPTERA( I). The Hemiptera, according to our system, terminate the numerous division of Insects which are provided with elytra, and of all those, are the only ones which have neither mandibles nor maxillre properly so called. A tubular, articulated, cylindrical, or conical appendage curved inferiorly, or directed along the pectus, having the appearance of a kind of rostrum, presents along its superior surface, when raised, a groove or canal from which may be protruded three rigid, scaly, extremely fine, and pointed setre, covered at base by a ligula. These setre, when united, form a sucker resembling a sting, sheathed in the tubular apparatus we have just described, where 'it is kept in situ by the superior ligula placed at its base. The inferior seta consists of two filaments which are united into one at a little distance from their origin, so that in reality the sucker is composed of four pieces. The inference drawn from this by M. Savigny, is, ·that the two superior setre, or those which are separate, represent the mandibles of the triturating Insects, and that the two filaments of the inferior seta correspond to their maxillre(2); this once admitted, the labium is replaced by the sheath of the sucker, and the triangular piece at the base becomes a labium. A true ligula also exists, and under a form analogous to that of the preceding piece but bifid at the extremity. The palpi are the only parts which have totally disappeared : vestiges of them, however, may be perceived in Thrips. The mouth of Hemipterous Insects is then only adapted for (1) Ryngota, Fab. (2) Or rather, i.n my opinion, to their terminal lobe, or that superior portion which in the Bees and Lepidoptera is prolonged into a thread or attenuated lamina, and reache~ beyond the insertion of the palpi. |
