COLEOPTERA. 389 



is transversal ; the Poecili, where it is almost as long as it Is ■wide, 

 and where the third joint of the rather short antennre is compressed 

 and angular ; and the Argutores similar to the Poecili, but whose an- 

 tennse 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 Pla- 

 tysma, Bonelli, with which we unite that of Omaseus, Zieg., andDej., 

 and the Catadromus of Mac Leay, Jun. * 



3. The third division of the Feronise will consist of species analo- 

 gous to those of the preceding one in the ensemble of their characters, 

 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 trun- 

 cated heart, with acute posterior angles. 



Those, in which the body forms along or cylindrical square, where 

 the thorax is almost square, hardly narrower behind than before, 

 form the genus Cophosus of Ziegler' and Dejean, It was established 

 on an Austrian species, the C. cijlindricusf. 



Those in Avhich the body is generally oval, depressed, or but 

 slightly concave above, w^th a wide, nearly square, and subisome- 

 trical 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 

 elytra, compose the genus Abax of Bonelli. 



Several species are fovmd in Germany. The one called the me- 

 tallicus, and tlie Molops striolatus, Dej., whose antennae are composed 



peared to me that they were most so externally. This Insect may form a separate 

 subgenus — Cijdosomus. As to the preceding ones, see the Species, Gener. dea 

 Coleop. Dej., III. 



* Those in which the body is much flattened, and the thorax considerably nar- 

 rowed posteriorly in the form of a truncated heart, will constitute a first division : 

 such is the Carahus picimanus, Duft., or the C. monticola of others; Count Dejean 

 places it in Pferoslirhus ; certain Brazilian species also belong to it. M. Germar — 

 Insect. Nov. Spec. I, 21 — describes one of them under the name of Molops corinfhius. 

 Those, in which the body nearly forms a parallelopiped, and the thorax is almost 

 square, but slightly or not at all narrowed posteriorly, will constitute a second 

 division. Of this number are the Platysma nigra, Bonel., and Dej., the Omasei of 

 the latter — Catal. p, 12 — and the Carabus tenebnoides of Olivier, the type of the 

 subgenus Catadromus of Mac Leay, Jun. — Annul. Javan. I, p. 13, 1, 5 — which only 

 differs from Omasetts in the tooth of the mentum, which is much larger and entire ; 

 the elytra have a large sinus, or rather an emargination at their extremity. It is 

 one of the largest species of this family. 



The Harpalus niyrita, anfhracinus, and aferriimts, of Gyllenhall, are Omasei. The 

 last has the posterior angles of the thorax obtuse, a circumstance which distinguishes 

 it from all the others. The Carabus leucopthalmus, Fab. or the melanarius of lUiger, 

 is placed in the same division, but it is apterous. 



t We will add to it the Omaseus melanarius, Dej., as well as another species of 

 Germany intermediate between the preceding ones and the Cophosus cylindricus, ant) 

 which, I think, is the Omaseus elonyatus Ziegler. 



