AMERICAN PHILOSOPHICAL SOCIETY. 573 



Iioney-yellow ; thorax somewhat smaller than the head, a little 

 obovate, obscurely rufous behind; elytra obscure rufous at tip; 

 tergum, posterior margins of the segments dull rufous ; feet pale 

 honey -yellow. 



Length nearly three-twentieths of an inch. 



Resembles the preceding in formi, and in the obtuse anterior 

 termination of the head. 



[Probably the same with Sunius prolixus Er. — Lec] 



RUGILUS Leach. 



R. DENTATUS. — Black; feet pale; elytra dull rufous at tip. 



Inhabits United States. 



Body piceous black ; head longitudinally wrinkled ; antennae 

 and palpi piceous ; labium large, bidentate in the middle, pice- 

 ous, rounded each side ; thorax smaller than the head, longi- 

 tudinally wrinkled, convex, with a longitudinal, glabrous line ; 

 elytra with numerous, minute, hairy punctures ; a subsutural im- 

 pressed line; posterior margin dull [458] rufous, or yellowish; 

 feet pale yellowish. 



Length over three-twentieths of an inch. 



Var. a. Posterior margin nearly black towards the suture ; 

 glabrous thoracic line almost obsolete. 



Much smaller than R. orhiculatus Payk., and the wrinkles of 

 the head and thorax are larger and more obvious. 



[Belongs to Stilicus. — Leg.] 



STENUS Latr. 



1. S. geniculatus. — Black; antennse and feet whitish. 



Inhabits United States, 



Body black, with a very slight cinereous tinge ; deeply punc- 

 tured ; head with a wide, but not very deep indentation each 

 side of the middle ; profoundly punctured ; antennae whitish ; 

 anterior part of the head with short whitish hairs; thorax punc- 

 tured like the head ; elytra also with profound punctures ; tergum 

 a deeper black than the elytra ; segments with large punctures 

 at base and small ones towards the tip; feet yellowish-white; 

 posterior knees blackish. 



Length less than one-fifth of an inch, 

 1834.] 



