402 STAPHYLINIDA. 
Hab. Mexico (Flohr), Cuernavaca, Capulalpam (Sa//é). 
Antenne elongate, only alittle thickened externally ; second joint elongate, but little 
shorter than the third, penultimate joint longer than broad. Thorax curved at the 
sides but not at all sinuate, a little narrowed in; front like the head, of a very shining 
black colour. Elytra not longer than the thorax. . 
This species is closely allied by the structural characters to P. fibularius, but in 
addition to the colour differences, it has the antenne less incrassate outwardly, and the 
thorax rather different in outline, owing to its being a little narrowed in front. The 
legs vary a little in colour, the tibize and tarsi being usually darker than the femora. 
The example figured is a female sent by Mr. Flohr. | 
14. Philonthus fibularius. 
Philonthus fibularius, Er. Gen. et Spec. Staph. p. 442°. 
Hab. Mexico (Flohr), Cordova (Sallé), Oaxaca, Las Vigas (Hége). 
This is apparently not a common species, but I have been able to examine a series of 
eighteen examples. It varies a little in the colour of the elytra, which is sometimes 
golden brassy tinged with purple, and in these brighter-coloured examples the thorax 
is a little longer and slightly sinuate at the sides. 
P. fibularius may be taken as the type of a natural little group of species, comprising 
besides itself the preceding and the five following species ; they all have the side-piece 
of the prothorax broad behind, and its marginal lines not connected in front, the 
superior line running on just under the front angle to the front surface, while the inner 
or inferior line is curved inwards in front to join the hind margin of the prosternum, an 
arrangement which much approximates the structure we find in Quedionuchus. 
15. Philonthus carinulatus. 
Niger ; capite subovato, thorace elytrisque viridi-eneis, his crebre sat fortiter punctatis ; abdomine versicolore, 
segmentis duobus ultimis stylisque analibus rufescentibus, tibiis piceo-testaceis; antennis extrorsum 
crassioribus ; mesosterno in medio subtiliter longitudinaliter carinulato. 
Long. 11 millim. 
Hab. Mexico, Jalapa (Flohr), Oaxaca, Las Vigas (Hoge). 
This species is precisely similar to P. fibularius, but the angle on the middle of the 
mesosternum has a fine carina running backwards from it, and the hind margins of the 
two last segments are broadly rufescent, as well as the anal styles. I have satisfied 
myself, by a careful comparison of about twenty examples of the two species, that these 
characters are constant and valid. 
One of the examples sent by Mr. Flohr was registered as found in an ants’ nest. 
