740 STAPHYLINIDA. 
12. Leptochirus cephalotes. 
Nigerrimus, sat depressus ; mandibulis dente superiore introrsum vergente, margine interno hand incrassato, 
dente supero-basali elongato ; prothorace transverso ; antennis extrorsum incrassatis, articulis penultimis 
transversis. 
Long. 15 millim. 
Hab. Mexico, Guanajuato (Sallé, Fauvel). 
This is readily distinguished from the allied species by the shorter thorax and the 
thicker antenne. The superior tooth of the mandible is remarkably elongate, quite 
acuminate, and without any sinuation internally; the internal teeth are placed further 
from the base than in the preceding species, and on the left mandible the lower tooth 
is bidentate, on the right simply acuminate. The punctures on the vertex seem to be 
variable: sometimes there are two on the middle, but these may be absent, and the 
anterior approximate punctures are quite obsolete. 
Four examples. I have preserved the name under which I received this insect 
from M. Fauvel, and with which it is labelled in M. Sallé’s collection. 
13. Leptochirus ramosus. 
Nigerrimus, sat depressus; vertice in medio bipunctato, anterius punctis duobus majoribus notato; mandibulis 
dente superiore elongato, introrsum valde curvato, margine interno simplice, dente supero-basali elongato ; 
prothorace subtransverso; antennis crassiusculis. 
Long. 17 millim. 
Hab. Mexico, Jalapa (Hoge). 
We have received only one example of this species; but I cannot doubt its being 
distinct. It is nearest to L. cephalotes, but the thorax is not so short, and the antenne 
are not so thick externally; the superior teeth of the mandibles are similar, but the 
internal teeth are different—the molar tooth on the left mandible having an extreme 
extension in the longitudinal direction, and not being distinctly divided, though its 
basal portion is abruptly narrower ; the corresponding tooth on the right mandible is 
approximately similar to that on the left, except that it has a rather deep emargination 
on the upper portion of its inner edge. The sculpture of the ventral rings is coarse 
and rather largely developed. 
PRIOCHIRUS. 
Acetabula anteriora posterius occlusa. Coxe anteriores contigue, haud brevissime. Prosterni processus post 
eas minutus, vix perspicuus. Mentum elongatum. 
This genus is very easily distinguished from Leptochirus by the prosternal struc- 
ture and by the more elongate mentum. The different species are nearly always less 
depressed in form than is the case in Leptochirus. The genus, in the New World, is 
limited to our region; but it will also include, for the present, the greater portion of 
the species of the Old World hitherto placed in Leptochirus. In some of the eastern 
species the shape becomes nearly cylindrical (P. mandibularis, e. g.), and the exsertion 
