104 NORTH AMERICAN 



Subdivision J. 

 Group I. 



This group contains but two species, both very abundant, well 

 known, and of very distinct appearance. They are nearly opaque, 

 and have' a roughly though evenly sculptured surface. The robust, 

 fulvous setae are very conspicuous. S. coitus might be placed here, 

 but it lacks the fulvous pubescence to a great extent. 



Our two species may be recognized by the following characters : 



Longitudinal sulcations of head distinct ; form slender 82. stygicus. 



Sulcations of head obsolete ; interocular surface flat ; form more robust. 



83. egeuus. 



82. S. Stygicus Say. — Form rather slender. Pubescence short, very 

 coarse, abundant, semi-erect, and setiform, pale flavo-cinereous. Head 

 moderate or small, scarcely twice as wide as long ; interocular surface 

 scarcely more than twice as wide as the eye, nearly Mat, very densely punc- 

 tured ; punctures shallow and sub-variolate, interspaces very narrow ; ocular 

 lines meeting at one length in advance ; longitudinal sulcations distinct ; 

 antennae somewhat longer than the width of head, dark fusco-piceous, base 

 black, club small but abrupt; third joint just perceptibly longer than the 

 fourth, sixth very slightly longer than the seventh, eighth sub-globular, 

 very small, joints of club nearly equal in size, tenth slightly the thickest ; 

 maxillary palpi dark fusco-piceous, first joint fusco-testaceous. Prothorax 

 widest notably before the middle, where it is five-sixths as wide as the head, 

 and one-fifth narrower than long ; sides thence feebly convergent posteriorly 

 and almost straight ; sides anteriorly evenly arcuate ; posterior margin 

 slightly longer and less arcuate than the anterior ; surface evenly convex, 

 rather coarsely, very closely, somewhat evenly, and variolately punctured, 

 interspaces very narrow, minutely granulated, and feebly shining. Elytra 

 at base very slightly wider than the head ; sides nearly parallel and strongly 

 arcuate, much longer than the width at base ; together broadly, very evenly, 

 and rather feebly emarginate posteriorly ; suture one-fifth as long again as 

 the pronotum ; surface evenly convex, coarsely, very closely, and evenly 

 punctate ; punctures wide, shallow, variolate, interspaces about one-fourth 

 their width, feebly shining. Abdominal segments decreasing very gradually 

 in width, first slightly narrower than the contiguous elytra; surface convex, 

 shining, rather finely, and somewhat distantly punctulate ; punctures im- 

 pressed ; transverse carinae 4-cuspid, cusps very short but distinct, intervals 

 feebly sinuate. Under surface of abdomen shining ; pubescence long, fine, 

 and recumbent ; rather coarsely and distantly punctulate. Legs moderate, 

 dark piceous, tarsi paler ; first joint of the posterior one-half as long again 

 as the second, second notably longer than the third. 



Male. — Posterior edge of the fifth ventral segment just perceptibly emargi- 

 nate throughout its width ; sixth broadly sinuate at the apex, sinus some- 

 what strong, evenly rounded, about six times as wide as deep. 



