300 INSECTA. 



general, proportionably longer. These latter species have been sepa- 

 rated from Pterostichus to form a new genus, the Steropus, Meg.(l) 

 Finally, we will terminate this subgenus with species, generally 

 large, in which the thorax, almost always, has the form of a trun- 

 cated heart, and the base of whose elytra has no transverse fold, 

 presenting almost a smooth space without any well terminated pos- 

 terior edge. Such appears to me to be the most distinguishing cha- 

 racter of the genus Percus, Bonelli. Neither the relative length of 

 the two last joints of the maxillary palpi, the inequality in the pro- 

 portions of the mandibles, nor some slight sexual difference taken 

 from the latter annuli of the abdomen, clearly distinguish it from the 

 other subgenera. These species are exclusively confined to Spain, 

 Italy, and the great islands of the Mediterranean. Some of them 

 are flattened above(2). 



Myas, Zieg. 



These Iusects resemble the Feronise which constitute the genus 

 Cheporus, but their thorax is more dilated laterally, and narrowed 

 near its posterior angles, immediately before which is a little emar- 

 gination. The labial palpi terminate in an evidently thicker and 

 nearly triangular joint. 



Two species are known, one from Hungary, the M. chalybasus, 

 and the other from North America, where it was discovered by 

 Major Le Conte(3). [The M. cyanescens, Dej. Am. Ed.~\ 

 Sometimes the mandibles are as long as the head, and extend con- 

 siderably beyond the clypeus. The body is always oblong, and the 



(1) See Dejean's Catalogue, and the Insect. Spec. Nov., Germar, I, p. 26, et 

 seq. Some species, such as the Molops terricola {Scarites gagates, Id. XI, i) and 

 the Steropus hottentotus {Scarites hottentotus, Oliv., Col. Ill, 36, 11, 19) were for- 

 merly placed among the Scarites. The Carabus madidus, Fab.; Faun. Insect., 

 Eur., V, 2, a common species in some of the southern departments of France is a 

 Steropus. Count Dejean forms a^new genus with the St. hottentotus on account 

 of the anterior legs, the tibiae of which are arcuated, and of some other charac- 

 ters. 



(2) Carabus Paykulii, Ross., Faun. Etrusc, I, tab. V, f. C, Percus ebenus, 

 Charp. Hor. Entom , V, i. See also the Ann. des Sc. Nat. and Ann. des Sc. 

 Phys., of MM. Bory de Saint- Vincent, Drapiez and Van-Mons. I refer the Abax 

 corsicus, Dej-, to the same subgenus. 



(3) Other species, analogous in the form of their labial palpi, but with stouter 

 mandibles, in which the tooth of the mentum is much larger, and peculiar to the 

 East Indies, form the genus Trigonomota of Count Dejean, the characters of 

 which are given in the third volume of his Species des Coleopteres. Here also 

 should be placed the genus Pseudomorpha of Kirby, Lin. Trans. XIV, 98. 



