COLEOPTERA. 8Ai 



side of the mandibles entirely (or nearly so) dentated throughout its 

 length. 



Here, the mandibles are arcuated, strongly dentated throughout 

 their length, and the lateral and exterior extremity of the two first 

 tibiae is prolonged into a point. The last joint of their exterior palpi 

 forms a longitudinal semi-oval with the internal side arcuated ; the 

 internal maxillary palpi are straight; their last joint is much larger 

 than the first, and almost ovoid. The mentum is profoundly emar- 

 ginate. Such are the characters of 



Pamborus, Lat. 



Of which but a single species, the P. alternans, Cuv. Reg. 



Anim. V, xiv, 2; Dej., Spec. II, p. 18, 19, is yet known. It 



was brought from New Holland by Messrs. Peron and Lesueur. 



There, the mandibles are straight, simply arcuated, or hooked and 



dilated at the extremity. The lateral extremity of the two anterior 



tibiae is not prolonged into a spine. The last joint of the exterior 



palpi is much larger than the preceding ones and concave above, 



almost in the form of a spoon. The mentum is deeply emarginate, 



longer in projjortion than in the following subgenera, thickened on 



the sides in most of them, and as if longitudinally divided into three 



spaces. The elytra are soldered, carinated laterally, and embrace a 



part of the sides of the abdomen. These Carabici compose the genus 



Cychrus of Paykull and Fabricius, since modified as follows : 



Those in wJiich the tarsi are similar in both sexes, the thorax is 

 cordiform and truncated, narrower posteriorly, or almost orbicular, 

 and not raised along the sides, with the posterior angles null or 

 rounded, alone retain the generic denomination of 



Cychrus, Lat. Dej.* 

 Those, in which the three first joints of the anterior tarsi of the 

 males are dilated, but slightly, and in the form of a palette, and in 

 which the thorax forms a trapezium, wide, emarginated at both ends, 

 with the sides turned up, and with acute and recurved posterior 

 angles, constitute another generic section, that of 



ScAPHiNOTus, Lat. Dej.\ 

 Finally, other species resembling the Cychri, but in which the two 

 first joints of the anterior tarsi of the males are generally dilated, and 

 form a patella with the third, which is less so, and cordiform, consti- 

 tute the 



SpHiERODERUS, Dej.\ 



The species of these two last subgenera are peculiar to America, 

 In the" second division of this section, we find Carabici with a thick 



* Cychrus rostratus, Fab. ; Panz. Faun. Insect. Germ., LXXIV, 6 ; Clairv., 

 Entora. Helv., II, xix, A ;— C. altenuaius, Fab. ; Panz. lb. IT, 3 ; Clairv. lb., xix, 

 B;— C. itaUcus, Bonel., Obs. Entom., Mem. of the Acad, of Tur. See Dej. Spec. 

 II, p. 4, et seq. 



t Cychrus elevatus, Fab. ; Knoch, Beytr., I, viii, 12; Dej. Spec. II, p. 17, et 

 seq. 



X Dej. Spec. II, p. 14. et seq. 



