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Show 448 INSECTA. angles, and leaving an hiatus between them aud the base of the elytra. The last joint of the antennae is at least as large as the preceding one(l). Other Pimeliariae are removed from the preceding ones by the form of their head and thorax. The first is a kind of square, more or less narrowed behind, and the middle of its anterior edge pre. sents an emargination which receives the labrum. The dilatation of the lateral margin covering the base of the antennce is greater, and prolonged to the anterior edge. The latter \)rgaus are always composed of eleven very distinct joints, almost cylindrical, the last few excepted, with the third very long. The middle of the outer side of the mandibles is deeply excavated, and the inferior sides of the head, forming the lateral casing or frame of the maxillre and mentum, terminate in a point, or in the manner of a tooth. The thot·ax is in the form of a truncated heart, and well emarginated before in most of them. These Pimeliariae comprise a great portion of the genus Arns, Fa b., Now restricted to those species in which the thorax is widerthan the head, strongly emarginated before, short, its posterior margin widely truncated, and the lateral edges turned up(2). Another species-.1.1. collaris, Fab.-in which the head mea· sured anteriorly is rather wider than the thor;tx, more prolong· ed posteriorly, and slightly strangulated at base in the manner of a neck, and where the thorax is much narrower throughout than the abdomen, small, convex, inclined and not turned up on the sides, forms the genus ELENOPIIORus, Meger. Dej., Where the antennae are also somewhat longer than in Akis, and the eyes are narrower and emarginated. The last Pimeliarire of that division, in which the mentum is emar· ginated, are distinguished from the preceding ones by the manner in which it terminates: instead of being rounded and divided into two festoons, it is slightly emarginate or concave, with the lateral angles acute, and proportionally shorter and narrower at its base or more cordiform; it covers the maxillae. The eleventh joint of the (1) Lat., Gener. Crust. et Insect., II, 154; the Jl.kis glabra, punctata, abbreviata, angustata, orbiculata, of Fabricius. I also think we should refer the Tagon~Tagona, Fischer, Entom. Russ., I, xvi, 8, 9-to this subgenus. (2) The first division of the .llkis, Fab. See also Fischer, l~ntom . Russ., I, xv, 7, 8, 9. COLEOPTERA. 449 nnz is not apparent; they are terminated by the tenth, which is ante ewbat larger than t h e prece dm' g ones, turb l' D·l~lO rm, an d 0 bl.1 quely somncated at the end. In the form of the head, its anterior emargintrauu. o n, and frequently also in. the figure of the thorax, these Insects closely t·esemble the true Ak1s. In EuRYouonA, .Thunb. The body is oval with acute and ciliated edges; the thorax semicircular, and receives the head into an anterior emarginatio~, the bdomen almost cot·diform. The antennae are composed of lmear joints, compressed o: angular, the third of which is longet· than the precediug and followmg ones( I). AnELOSTOMA, Dup. These Insects have a narrow and elongated body, with an almost square thorax, slightly narrowed posteriorly; the antennre tolerably stout, almost perfolia ted, and all the joints, the last excepted, nearly lenticular and equal. Their labrum, mandibles and palpi are con-cealed( 2). We will terminate the Pimeliariae with those in which the supe-rioredge'of the square mentum is neither emal'ginated nor widened. Their body is always oblong, and the thorax sometimes almost square, rounded or dilated, and at others narrow, elongated, almost cylindrical, and the abdomen ovoid or ?val •. The. antennae. always consist of eleven distinct joints. The antertor thtghs are mflated, and even sometimes dentated in several or at least in one of the sexes. These Insects evidently form the passage from this tribe to the following one. . Sometimes the antennre are entirely or almost entirely granose or composed of short joints, eithet• ovoid or globular, turbiniform, or almost hemispherical. . Of these some resemble the Pimeliariae of the last subgenera m ' . the dilatation and prolongation of the lateral margm of the head. Their labrum is very short or projects but little. The lateral borders of the thorax are straight or simply arcuated and rounded, and without any angular or dentiform dilatation. 'fhe eyes are but slightly protuberant. (1) Lat., Gen~r. Crust. etlnsect., II, p. 150; Schamh., ~ynon. Insect., I, ii, 5;- Schamh., Synon. Insect. I, i, tab. 2, 5. · . · (2) .IJ.deloatoma sulcatum, Duponchel, Mem. de la Soc. Lin. ~e Paris~ 1827, XII; ' A, B, C1 an Insect found in the environs of Cadiz by the son of that savant, a Tangier by M. Goudot, Jun., but brought from Syria a lon~ time ago by M. Labillardiere. Vat. III.-:3 G |
