414 STAPHYLINIDA. 
sible to represent satisfactorily by colour the delicate but brilliant metallic tints of the 
anterior parts of this insect. 
46. Philonthus nugax. 
Niger, nitidus ; capite oblongo, antennis latis, articulis 4°-10™ transversis, elytris abdomineque crebre subtiliter 
punctatis ; pedibus piceis. 
Long. 6 millim. 
Hab. Mexico, Mirador (fH6ge). 
Head very slightly narrowed behind the eyes, with a small longitudinal impression 
on the middle in front. The very broad antenne are much shorter than the head 
and thorax, joints 5-10 very strongly transverse. Thorax elongate, much narrower 
than the elytra, shining black with a slight sericeous lustre. Scutellum densely 
punctate. 
Although I am not able to describe the sexual characters, only a unique female 
having been found, yet this little insect should be readily recognized by the unusually 
thick antenne. 
47. Philonthus infimus. (Tab. XI. fig. 4.) 
Depressus, niger, nitidus ; abdominis segmento ultimo rufo-testaceo ; capite quadrato, utrinque punctis paucis 
majoribus; prothorace posterius angustato; elytris parce, minus subtiliter, abdomine apicem versus 
crebrius, punctato. 
Long. 6 millim. 
Hab. GuatemaLa, Las Mercedes 3000 feet, Chiacam (Champion); Panama, Volcan 
de Chiriqui (Champion). 
Antenne short and stout, with joints 5-10 rather strongly transverse. Head broad, 
with a few remarkably distinct coarse punctures on each side, and finely canaliculate 
on the middle in front. Scutellum rather finely punctate. Elytra finely and sparingly 
punctate, black, shining. Hind body with the basal segments only sparingly and 
finely, the two or three penultimate segments closely and rather finely punctate. 
Legs rather stout and short, the hind tarsi short, the basal joint not longer than the 
apical one. 
In some examples the head is larger, and I have no doubt these are the males, though 
I cannot detect other indication of their sex; one of these larger-headed individuals 
from Las Mercedes is figured. 
This and the three following species form a peculiar group; they have much the 
facies of the genus Holisus, and resemble those insects by the depressed flattened shape 
and the stouter, shorter legs; the side piece of the prothorax is very small, and so 
greatly inflexed that it is not seen at all when the insect is examined at the side; the 
marginal line is inflexed to the under surface for all its length, so that it is not visible 
at all from above, and the elongate lateral seta is consequently remote from it. 
