| OCR Text |
Show 310 INSECTA. rous. They constitute a particular section, the sixth of the g enu~ which we will name the GaANDIPALPr(t). A first division is thus characterized: the body always thick d ap~erous; labrum always b1' lo b ate; Ia st J· O·t nt of the exterior paanl . . . f h pt always very large; emargmat10n o t e mentum edentate; internal side of the mandibles entirely (or nearly so) dentated throughout its length. Here, the mandibles are arcuated, strongly dentated throughout their length, and the lateral and exterior extremity of the two first tibire is prolonged into a point. The last joint of their exteriorpalpi forms a longitudinal semi-oval with the internal side arcuated; the internal maxillary palpi are straight; their last joint is much larger than the first, and almost ovoid. The mentum is profoundlyemar· ginate. Such are the characters of ' • PAMBoRus, Lat. Of which but a single species, the P. alternans, Cuv. R~g. Anim. V, xiv, 2; Dej., Spec. II, p. 18, 19, is yet known. It was brought from New Holland by Messrs Peron and Lesueur. There, the mandibles are straight, simply arcuated, or hooked and dilated at the extremity. The lateral extremity of the two an. terior tibia:: is not prolonged into a spine. The last joint of the exterior palpi is much larger than the preceding ones and concave above, almost in the form of a spoon. The mentum is deeplyemar· gin ate, longer in proportion than in the following subgenera, thick· ened on the sides in most of them, and as if longitudinally divided into three spaces. The elytra are soldered, carinated laterally, and em brace a part of the sides of the abdomen. These Carabici com· pose the genus Cychrus of Paykull and Fabricius, since modified as follows: Those in which the tarsi are similar in both sexes, the thorax is cordiform and truncated, narrower posteriorly, or almost orbicular, and not raised along the sides, with the posterior angles null or rounded, alone retain the generic denomination of CYoHRus, Lat. Dej.(2) Those, in which the three first joints of the anterior tarsi of the ( 1) A more characteristic denomination than that of .O.bdmninalu which we formerly gave them. (2} Cychrw roatratus, Fa.b.; Panz. Faun. Insect. Germ., LXXIV, 6; Clairv., En· tom. Helv ., II, xix, A ;-C. attenuatus, Fa b.; Panz., lb. II, 3; Clairv. lb., xix, B;~ COLEOPTERA. ' 311 males are dilated, but slightly, and in the form of a palette, and in which the thorax forms a trapezium, wide, emarginated at both ends, with the sides turned up, and with acute and recurved posterior angles, constitute another generic section, that of SoAPHINOTus, Lat. Dej.(t) Finally, other species resembling the Cychri, but in which the two first joints of the anterior tarsi of the males are greatly dilated, and form a patella with the third, which is less so, and cordiform, constitute the SPH.lERODERus, Dej.(2) The species of these two last subgenera are peculiar to America. In the second division of this section, we find Carabici with a thick body, and most commonly apterous, like the preceding, but in which the middle of the emargination of the mentum is provided with an entire or bifid tooth, and where the mandibles are, at most, armed with one or two teeth, situatet.l at their base. The thorax is always in the form of a truncated heart. The abdomen is most frequently oval. Some of them, in which the labrum is occasionally entire, have all the tarsi identical in both sexes. · TEFFLus, Leach. The Teffii are the only ones of this division in which the labrum isentire or unemarginate. T. Jl!legerle; Carabus Megerlei, Fa b.; Voet., Col. II, xxxix, 49. Nearly two inches in length; all black; thorax rugose· elytra divided by longitudinal ribs with elevated points in thei; sulci, last joint of the exterior palpi very large, elongated and securiform, the internal edge curvilinear; tooth in the emargination of the mentum small; third joint of the antenna:: at least thrice the length of the second. PRooERus, Meg. The labrum bilobate. All the known species .are large, entirely black, or black underneath, and blue or greenish above with ex-c itol' · ICU8, Bonel., Obs. Entom., Mem. of the Acad. of Tur. See Dej. Spec. II, p.4, et seq. [Am. species, C. viduU6, Say. .!J.m. Ed.] t (l) Oychrua elevatus, Fab.; Knoch, Beytr., I, viii, 12; Dej. Spec. II, p. 17, e seq, (2) Dej. Spec. II, p. 14, et seq. |
