COLEOPTERA. 399 
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 proportion 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 which 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 Avhich 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 
Sph^roderus, 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 
* Cvchnis rostratus, Fab.; Panz. Faun. Insect. Germ., LXXIV, 6 ; Clairy., 
5ntom. Helv., II, xix, A C. attenuate, Fab. ; Panz. Ib. II, 3 ; 
I C. italicus, Bond., Obs. Entom., Mem. of the Acad, of Tur. See Dej. ^pec. 
\levatus, Fab. ; Knoch, Beytr., I, viii, 12; Dej. Spec. II, p. 17, et 
eq. 
I Dej. Spec. II, p. 14. et seq. 
