692 . STAPHYLINIDZ. 
portion impunctate, and in the male polished, and produced as a triangular process, with 
decurved spinose apex. Thorax about twice as long as broad; the three dorsal grooves. 
very deep, definite, and straight; the large lateral cavity surrounded by a small 
amount of strigose punctuation. Elytra but little longer than the thorax, rather 
coarsely strigose-punctate; at the outside there is an impressed line. The abdominal 
characters of the male are very slight indeed: the hind margin of the terminal ventral 
plate is feebly sinuate, and the preceding segment has some very fine punctuation on 
the middle. 
This is one of a group of species the determination of which on a small number of 
specimens is very difficult; I supposed them, indeed, to be mere variations of one 
species, till I examined the male characters. The late Mr. Janson obtained many 
examples of this insect. 
12. Oxytelus armatifrons. 
Piceus; mandibulis, antennarum basi, pedibus elytrisque testaceis, his brevibus, strigoso-punctatis ; prothorace 
profunde trisulcato; antennarum articulo ultimo subquadrato, parum transverso. 
Mas clypei medio longius spinoso-producto. 
Long. 4 millim. 
Hab. Panama, Bugaba (Champion). 
In the male of this species the head has the whole of the back part densely strigose, 
and there is an elongate, oblique, longitudinal channel on each side, but no conspicuous 
depression in the middle, and the anterior part is polished, and produced so as to form a 
long spine; the middle of the hind margin of the last ventral segment projects a little, 
thus forming a short, broad, subacuminate lobe. 
We have received only two males of this species; though extremely similar to 
O. spinifrons, it differs in the sexual characters, and is therefore probably distinct. 
13. Oxytelus stipes. 
Piceus, nitidus ; elytris dilutioribus, antennis apicem versus sordide testaceis, mandibulis pedibusque testaceis ; 
prothorace profunde trisulcato, haud punctato ; elytris brevibus, profunde strigoso-punctatis. 
Mas clypei medio longius spinoso-producto. 
Long. 4 millim. 
Hab. Panama, Bugaba (Champion). 
We have only a single male of this species, and, though very similar to 0. spinifrons 
and O. armatifrons, there is little doubt it is distinct. The antenne are rather long 
and slender, neither the fifth nor the tenth joint being transverse. The head is 
densely, regularly, longitudinally strigose on the disc, the vertex, however, being shining 
and canaliculate in the middle; on either side there is a remarkably conspicuous 
elongate, oblique, longitudinal channel, and the polished clypeus is produced in front 
to form avery long spine. The thorax is very short. The abdominal characters are: 
