COLEOPTERA. 305 



Anchomenus, Bon.(l) 



There, the inferior surface of the tarsial palette is furnished with 

 a compact and continuous brush. The exterior palpi, those of the 

 labium in particular, are terminated in several by a thicker or wider 

 joint in the form of a reversed triangle. 



We will commence with those in which they are filiform. 



Callistus, Bon. 



The tooth in the emargination of the mentum entire; exterior 

 palpi terminated by an oval joint pointed at the end; thorax in the 

 form of a truncated heart(2). 



Oodes, Bon. 



Similar to Callistus in the tooth of the emargination of the men- 

 tum, but the last joint of the external maxillary palpi is cylindrical* 

 while that of those attached to the labium forms a truncated oval. 

 The thorax is trapezoidal, narrower before, and as wide posteriorly 

 as the base of the abdomen(S). 



Chl^enius, Bon. 



Tooth of the emargination of the mentum bifid; exterior maxil- 

 lary palpi terminated by an almost cylindrical joint, somewhat 



XXXVIII, 17? C. parum-punctatus, Fab.; Panz., lb. XCII, 4; C. 4-punctatus, 

 Fab.; Oliv., Col. Ill, 35, xiii, 158. See Catalogue, Dej., who has formed a new- 

 genus of the A. rotundatum, and some others. 



The genus, here alluded to by our author, is the Olistiiopus, Dej., who, while he 

 seems strongly inclined to form but one section of Agonum and Anchomenus, 

 from the occasional, almost total, obliteration of the distinguishing characters of 

 each, so that in some cases it is hardly possible to say whether an Insect should 

 be referred to the first or the second, has deemed it necessary to separate the 

 above species, which differ from Agonum in several essential characters, and 

 principally in the absence of the tooth of the middle of the emargination of the 

 mentum. See his Species, &c, III, p. 1~6, and add of American species of Ago- 

 num the A. octopimctatum {Feronia octopundata, Say), cupripenne, nitidulum, mo- 

 rosum, femoratum, melanarlum, &c, &c. Am. Ed. 



(1) Carabus prasmus, Fab.; Panz., lb., XVI, 6; C. albipes, Fab.; Panz., lb. 

 LXXIII, 7-C. oblongus, Fab.; Panz., lb. XXXIV, 3. [Add for American spe- 

 cies, the Anch., gagates, sinuatus, corvhms, elongatulus, extensicollis, thoracicus, 

 &c, &c. Am. Ed.] 



(2) Carabus luneatus, Fab.; Panz. Faun. Insect. Germ. XVI, 5; Dej. Spec. II, 

 p. 296. 



(3) Carabus helopioides, Fab.; Panz., lb., XXX, ii. See Dej. Spec. II, p. 374. 



Vol. Ill 2 O 



