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Show 512 INSECT~. CAMPTOOERus, Dej.-Hylesinus, Fab. Where the antennre of the males are strongly geniculate and fur. nished exteriorly with long hairs or threads; they are inserted at a considerable distance from the eyes, which are elliptical and ob. lique( 1). PLoioTRIBirs, Lat.-Hylesinus, Fab. The Ploiotribi are removed from all the other Insects of this fa. roily by the club of their antennre, which is composed of three elon. gated leaflets(2). . . Sometimes ail the joints(3) of the tarsi are entire, and the club or the antennre, always solid and compressed, commences at the sixth or seventh joint. In ToMious, Lat.-Ips, De Geer,-Bostrichus, Fab. The antennre are not susceptible of being folded under the eyes, and their club is distinctly annqlated. The head is rounded above, and almost globular( 4). There is an emargination on the side of the thorax. The tibire are not striated. The tarsi, at most, are as long as the latter with the first joint but slightly elongated. The body is cylindrical, and the eyes are elongated and somewhat emarginated( 5). PLATYPus, Herbst.-Bostrichus, Fab. The antennre shorter than the head, fold under the eyes and ter· ' .. minate in a very large club without distinct annuli. The body 1s h· near and the head cut verticaiiy before; the eyes are almost round ' . and entire. The thorax is emarginated on each side to rece1ve a por· tion of the anteri thighs; the two anterior tibire are divided on their posterior face by transverse ridges; the tarsi are long and very slen· ( 1) Hyle3inus ameipennis, Fab. (2) Lat., lb., P· 280. (3) They appear to be five in number; the penultimate is very small .. Th~tw~ posterior legs are very remote from the preceding ones, and the body 1s cylmdri· cal or linear. The antennre are very short. ( 4) Broadly bilobate behind. According to M. Dufour their chylifi~ ventricle, which fot•ms two thirds of the whole length ol' the alimentary canal, 1s cove~ with papilla:, while that of the Bostrichi is perfectly smooth. The same naturalls has observed worms, resembling Ascarides, in the intestinal canal of the former as well as in that of various other Coleoptera. (5) La.t., Gener. Crust. et Insect., II, p. 276. COLEOPTERA. 513 der, their first joint being much elongated. The two posterior legs are placed very far back(l ). . The others have large and very apparent palpi of unequal lengths. Their body is depressed and narrowed before; their antennre sometimes consist of two joints, the last of which is very large, flattened, and almost triangular or nearly ovoid, and sometimes of ten, and are entirely perfoliate. The labium is large; the elytra are truncated, and tarsi short, with all the joints entire. These Insects are all foreign to Europe and compose the genus PAussus, Lin. Fab. Those in which the antennre consist of but two joints, with the last large and compressed, form the subgenus PAussus proper. A species-F. bucephalus, Schrenh., Synon. Insect., I, 3, App. VI, 2-in which the head resembles two simple eyes; where the eyes are small and but slightly prominent, and where the antenn< e, hardly longer than the head, are laid on its anterior face, and terminated in an acuminated joint, constitutes the genus Hylotorus of Dalman-Anal. Entom., p. 102(2). Those in which the antennre consist of ten entirely perfoliate joints form the subgenus CERAPTERus, Swed.(3) 2. A second section will comprise those Xylophagi, whose antennre consist of but ten joints, and in which the palpi, at least those of the maxillre, do not gradually taper to a point, but are of equal thickness throughout, or dilated at the extremity. The joints of their tarsi are always entire. We will divide them into principal genera, according to the mode in which the antennre terminate. The three last joints form a perfoliate club in the first, or (1) Ibid., p. 277. M. Dalman has figured a species-flavicornis:2, Fab.-enclosed in amber. (2) See Lat., Gener. Crust. et Insect., III, p. 1, and Schamherr, Synon. Insect. I, 3, App. vi, 1. . (3) Lat., Gener. Crust. et Insect., III, p. 4. VOL. III.-3 p |
