COLEOPTERA. 71 



Cambridge, Massachusetts, 3. 



This species is readily distinguished by the tarsal structure, and 

 the very irregular channeled sculpture of the elytra. 



52. S. incilltlis 11. sp. — Form moderately slender. Pubescence rather 

 long, close, recumbent, cinereous, very conspicuous on the abdomen. Head 

 rather small, twice as wide as long ; interocnlar surface scarcely twice as wide 

 as the eye, just perceptibly depressed ; almost equally trilobed by the very 

 indistinct sulcations ; intermediate surface very feebly convex, punctures 

 moderately coarse, rather close and even, occasionally coalescent in twos or 

 threes ; ocular lines meeting at one length in advance ; antennae much longer 

 than the width of head, black, slender, club moderate and rather densely 

 clothed with short cinereous pubescence ; third joint one-third as long again 

 as the fourth, fourth and fifth equal, sixth and seventh joints but little 

 shorter, the latter very slightly the shorter and thicker, eighth feebly elon- 

 gated, slightly thicker than the seventh, ovoidal, joints of club increasing 

 uniformly and very gradually in length and thickness ; maxillary palpi 

 moderate in length, piceous-black throughout; labrum narrow and very 

 strongly arcuate anteriorly. Prothorax v^yy gradually and arcuately widen- 

 ing to a point just in advance of the middle, where it is four-fifths as wide as 

 the head, and nearly one-sixth narrower than long; sides thence moderately 

 convergent and very feebly sinuate ; anterior margin distinctly longer than 

 the posterior, equally arcuate; surface almost evenly convex, rather finely, 

 feebly, closely, coalescently, and somewhat confusedly punctate ; canalicula- 

 tion in the form of a narrow, indistinctly outlined, shallow erosion, extending 

 nearly to the margin. Elytra at base just perceptibly wider than the head ; 

 sides almost parallel, slightly longer than the width at base, rather strongly 

 and evenly arcuate; together broadly and rather strongly emarginate be- 

 hind ; suture about one-eighth as long again as the pronotum ; surface very 

 feebly impressed on the suture at the base, rather finely, very closely, rather 

 feebly, and very confusedly punctured and channeled. Abdominal segments 

 decreasing uniformly and very gradually in width, first very slightly nar- 

 rower than the contiguous elytra ; surface moderately convex, finely, rather 

 distantly, and evenly punctulate ; transverse carinae 4-cuspid, middle cusps 

 short, fine, and aciculate, lateral broader and acuminate. Legs rather long 

 and slender, black, rather densely clothed with short cinereous pubescence; 

 first joint of the posterior tarsi one-half as long again as the second, distinctly 

 shorter than the last, second nearly one-half as long again as the third. 



Male. — Fifth ventral segment very feebly emarginate in its middle three- 

 fifths at apex, emargiuatiou evenly rounded, and scarcely measurable, con- 

 tiguous surface normally convex ; sixth segment broadly and feebly sinuate 

 at apex, sinus nearly as broad as the entire segment, very evenly rounded, 

 about ten times as wide as deep ; seventh segment narrow and almost squarely 

 truncate at the apex, teeth very small, acute. 



/•'» mule-. — Unknown. 



Length 3.1 mm. 



Arizona, 1. 



