STAPHYLINID.E 445 



mens identified as qiiadmlus measure 6.3-8.5 mm. in length, while 

 the length given by Dr. Horn is 6 mm., but they are probably 

 identified correctly, although the author confused several species. 



Philonthus sagax n. sp. Form subparallel, long and rather slender, 

 similar in coloration and lustre to the preceding, the antennae almost 

 similar; head broader, wider than long, the eyes very much more convex 

 and prominent, at a fourth more than their length from the base, the 

 tempora much less prominent, straight and converging behind them for 

 some distance, then rapidly rounding, becoming subtransverse to the 

 neck; punctures toward the sides much smaller and more widely separ- 

 ated, coarse and deep in the transverse area on the front anteriorly; 

 prothorax slightly longer than wide, much narrower than the head, 

 obliquely somewhat narrowed behind from near the middle; punctures 

 nearly as in the preceding but laterally more numerous; elytra but very 

 slightly longer than wide, distinctly wider and longer than the prothorax; 

 punctures not coarse but deep and conspicuous, moderately close-set; 

 abdomen as in the preceding, the basal tergites rather sharply impressed 

 transversely at base; sixth ventral (cf) with a small and rather deep apical 

 sinus, only the bottom of which is bordered narrowly by membranous 

 integument; anterior tarsi rather feebly dilated, and similarly testaceous. 

 Length (cf 1 ) 7.5 mm.; width 1.25 mm. Arizona (Nogales). 



Distinguishable at once from gracilior by the shorter elytra, 

 prominent eyes and converging tempora, among other differences; 

 also by the smaller and sparser punctures toward the sides of the 

 head, in which it agrees better with quadrulus. 



Belonuchus Nordm. 



This genus is related very closely to Philonthus but may be known 

 by the short spiniform setae along the lower edge of the anterior 

 femora, the undilated anterior tarsi, longer mandibles, thick an- 

 tennae and by a certain habitus which is usually easy to recognize. 

 Omitting the very well known formosus Grav., of the Atlantic 

 regions and ephippiatus Say, which is Mexican, not occurring north 

 of the boundary and allied to the larger erythropterus , there are in 

 my cabinet the eight following species: 



Upper surface black throughout, except the elytra, which are bright red . 2 



Upper surface black, the elytra and abdomen rufous, the latter black at 

 or toward apex 5 



Upper surface testaceous throughout, the last two segments of the ab- 

 domen abruptly black 7 



2 Abdominal punctures strong, very close-set and conspicuous above 

 and beneath. Male with the head large, quadrate, the eyes not at 

 all prominent, at nearly three times their own length from the base; 



