206 CLASS INSECTA. 



nearly heart-shaped or sub-orbicular ; the antennas are fili- 

 form, composed of articulations for the most part cylindrical, 

 especially the last (the other being more slender at the base, 

 and nearly in form of a reversed cone, and the last articula- 

 tion of the outer palpi is nearly oval or spindle-shaped). 

 The labrum is emarginated. 



These belong to the warm and sandy countries of the 

 eastern parts of the old continent. 



DiTOMUs, Bon. Carabus, Calosoma, Scaurus, Fab. 



Whose palpi are shorter than the head, the corslet is heart- 

 shaped, and the tarsi are short. 



Some species, those to which M. Ziegler restores the gene- 

 ric denomination of ditomus, have the body more elongated, 

 of the same width, with the head separated on each side from 

 the corslet by a re-entering angle ; and the males are com- 

 monly armed with one or two horns.* 



The others, or those which compose the genus Aristus, of 

 the same, have the body shorter, wider in front, with the 

 head nearly contumous, with the corslet buried therein as 

 far as the eyes ; the anterior angles are pointed. + 



Apotomus, Hoff. Scarites, Ross. 



The anterior palpi, of which are very long, the corslet orbi- 

 cular, and the tarsi filiform and elongated. The external 

 maxillary palpi are much longer than the head, and termi- 

 nated by an ovoid-cylindrical articulation. The same of the 



* Dej. Spec. I. p. 439. ; first division of Ditomus ; Carabus Calydonius, 

 from a note sent by him with an individual from the collection of M. Des- 

 fontaines, forms a very distinct species from Ditomus calyddvius of M. le 

 Corate Dejean. The males have the mandibles forked, or as if divided into 

 two horns; the horn of the middle terminates in a point, or rather in a 

 lance-head ; Calosoma longicornis of Fab. is probably the female of this or 

 of an allied species. 



t The second division of Ditomus ofM. C. Comte Dejean, ibid. p. 444. 



