298 INSECTA. 



mandibles somewhat less salient. In their habits these species 

 approach the Zabri and Harpali. Such are the Amar3e(l), whose 

 thorax is transversal; the Poecili, where it is almost as long as it is 

 wide, and wUere the third joint of the rather short antennae is com- 

 pressed and angular; and the Argutores similar to the Poecili, but 

 whose antennae 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/ysma, 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 Feronix will consist of species analo- 

 gous to those of the preceding one in the ensemble of their chauac- 

 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 Leirus of some authors. The Scolylus Jiexuosus, Fub., 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 sepa- 

 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 considerably nar- 

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

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

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

 Insect. Nov. .Spec. I, p. 21^-describes one of them under the name of Molops 

 corinthius. 



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

 most square, but slightly or not at all narrowed posteriorly, will constitute a se- 

 cond division. Of this number are the Platysma nigra, Boiiel., and Dej., the 

 Omasei of the latter — Catal. p. 12 — and the Carabus tenebrioides o{ Olivier, the 

 type of the subgenus Catadromus of Mac. Leay, Jun. — Annul. Javan. I, p. 18, 1, 

 5 — which only difl"ers from Omaseus 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 ia one of the largest species of this family. 



The Harpalus nigrita, anthracinus, and aterrimus, of Gyllenhall, are Omasei. 

 The last has the posterior angles of the thorax obtuse, a circumstance which dis- 

 tinguishes it from all the others. The Carabus leucopthalmus, Fab. or the melan- 

 arius of Illiger is placed in the same division, but it is apterous. 



