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Show 298 INSECTA. mandibles somewhat less salien. t. In their habits these sp ec1.e s appt·oach the Zabl'i and Harpah. Such are the Amar::e(t) wh P .1. h . . ' ose thorax is transversal; the cec1 1, w ere 1t 1s almost as long as it . . , f II wide, and where the third JOlDt o the rather short antenn::e is co . pressed and angular; and tl~e A rgutores s1· m1' l ar to the Pcecili, hmut whose antennre are proportiOnably longer, and their third joint not angular. 2. The species usually furnished with wings, but in which the body is straight, plane or horizontal above, with a nearly equally wide head. They frequent cool or damp places. Such is the genus Platysma, Bonelli, with which we unite that of Omaseus ' Zieg ., and Dej., and the Catadromus of Mac Leay, Jun.(2) 3. The third division of the Feronire will consist of species analogous to those of the preceding one in the ensemble of their charac. ters, but differing from them by the absence of wings. Of these, some, the most numerous, and in which the thorax is not always in the form of a truncated heart, have a well marked, continuous, transverse fold or border at the base of the elytra, that extends to the suture. Sometimes the thorax is almost square, or has the form of a truncated heart, with acute posterior angles. (1) Shorter species, whose thorax widens from before posteriorly, constitute the genus Leirua of some authors. The Scolytua .ftexuosus, Fab., seems referable to this division, but according to count Dejean the four anterior tarsi are dilated: it appeared to me that they were most so externally. This Insect may form a sept· rate subgenus-Cyclosomus. As to the preceding ones, · see the Species, Gener. des Coleop. Dej., III. (2) Those in which the body is much flattened, and the thorax considerablyll21" rowed posteriorly in the form of a truncated heart, will constitute a first division: such is the Carabus picimanua, Duft., or the C. monticola of others; Count Dejean places it in Pterosticltus; certain Brazilian species also belong to it. M. Gennai'Insect. Nov. Spec. I, p. 21-describes one of them under the name of Molup~ corinthius. Those, in which the body nearly forms a parallelopiped, and the thorax is~· most square, but slightly or not at all nan-owed posteriorly, will constitute a se· cond division. Of this number are the Platysma nigra, Bonel., and Dej., the Omaaei of the latter-Catal. p. 12-and the Carabua tenebrioidea of Olivier, the type of the subgenus Catadromus of Mac Leay, Jun.-Annul. Javan. I, p. 18, ~ 5-which only differs from Omaaeua in the tooth of the mentum, which is much larger ~nd entire; the elytra have a large sinus, or rather an emargination at their extremtty. It is one of the larg•t species of this family. The Harpalus nigrita, anthracintts, and aterrimus of Gyllenhall are OmaJti. The last has the posterior angles of the thorax obtus~ a circumstan~e which dis· tin.guishes .it fr~m all the others. The Carabu8 leucop;halmus, Fab. or the me/all· artus ofll11ger ts placed in the same division, but it is apterous. COLEOPTERA. 299 Those, in which the body forms a long or cylindrical square where the thorax is almost square, hardly narrower behi~d tha~ before, form the genus Cophosua of Ziegler and Dejean. It was established on an Austrian speci~s, tlae C. cylindricus( 1 ). Those in which the body is generally oval, depressed, or but slightly concave above, with a wide, nearly square, and subisometrlcal thorax, whose lateral margin is always strongly reflected, and is as wide, or nearly as wide, at its posterior margin as the base of the ely a, compose the genus .IJ.bax of Bonelli. Several species are found in Germany. The one called the metal/ icua, and the Molops striolatus, Dej. whose antennre are composed ofshorter joints, or are nearly granose, have been formed into a new genus, styled Cheporus(2 ). The F. striola; Carabua striola, Fab.; Carabua depressus, Oliv., Col. III, 35; IV, 46, is often found in the cold or humid localities of the forests in the environs of Paris(3). Sometimes the thorax, always terminated posteriorly by two well marked or acute angles, is evidently narrowed behind. Its figure approaches more or less to that of a truncated heart. Of these species, several have the body depressed or plane above, and the antennre com posed of elongated joints, rather obconical than turbinated. They are distinguished generally by Bonelli under the genuine name of Pterostichua. They more particularly inhabit the high mountains of Europe, and Caucasus. But a single species-Carabus oblongo-punctatus, Fab.; Panz., Faun. Insect. Germ., LXXIII, 2-is found in the environs of Paris( 4). Others, whose antennre are almost granose, have the body convex above, and proportionably wider, with a shorter abdomen. They form the genus Molops, Bonelli, which evidently leads to other very analogous Feronire, but where the posterior angles of the thorax are rounded, and the abdomen oval, the exterior angle of the base of the elytra being obtuse or non-salient. The body and antennre are, in (1) We' will add to it the Omaseua melanariua, Dej., as well as another species of Germany intermediate between the preceding ones and the Cophotms cylindricw, llld which, I think, is the Omaseus elongatua, Ziegler. . (2) The Platysma: described and figured by M. Fischer-Entom. Russ,, , II, 11X, 4, 5;-are probably analogous Abaces. (3) For the other species, see the Catalogue of Count Dejean, and the Faun. Aust. ofDuftschmid (4i For the other ~pecies see Dejean's Catalogue and the E.ntom. Jluss., Fischer, II, P· 12$, xix, f. l; xxxvii, 8, 9. I coincide with the opinion of the latter, that the G. my0$odua, Meg., does not essentially differ from Pteroltichw. |
