COLEOPTEUA. 101 



first joint translucent and pale piceo-testaceous, third robust, nearly as long 

 as the first and second together. Prothorax widest slightly in advance of the 

 middle, where it is five-sixths as wide as the head, and distinctly narrower 

 than long ; sides thence rather rapidly convergent posteriorly and distinctly 

 sinuate ; anterior margin slightly longer than the posterior, equally arcuate ; 

 surface broadly flattened above, feebly tuberculate near the basal angles, 

 and broadly swollen throughout the length and breadth of the anterior half 

 of the pronotum ; punctures rather small, somewhat variform, generally 

 rounded and very close, interspaces feebly convex, distinctly granulate and 

 feebly shining. Elytra at base just perceptibly narrower than the head ; 

 sides moderately divergent posteriorly, slightly longer than the width at 

 base, nearly straight ; together broadly, roundly, and rather strongly emar- 

 ginate behind; suture one-seventh as long again as the pronotum; surface 

 feebly impressed on the suture toward the base, coarsely and rather closely 

 punctured ; punctures seldom coalescing, round, very variable in size and 

 distance, being small and widely isolated near the inner basal angles, and 

 very large and closely crowded behind the middle. First three abdominal 

 segments sub-equal in width, and as wide as the contiguous elytra ; surface 

 coarsely and closely punctulate, much more finely so toward the tip ; trans- 

 verse carinae tricuspid, cusps rather long, finely acuminate, and distant, 

 lateral slightly shorter and inclined inward. Legs moderate, piteous-black 

 above, femora dark piceo-rufous beneath ; first joint of the posterior tarsi 

 two-thirds as long again as the second, much shorter than the last, joints 

 two to four decreasing uniformly and very gradually in length. 



Mule. — Unknown. 



Female. — Sixth ventral segment very evenly rounded behind throughout. 



Length 2.7 mm. 



Detroit, Michigan, 1. 



This species is easily recognized by the broadly rectangular, though 

 rather moderate and superficially flattened swelling, which occupies 

 the entire anterior half of the pronotum. 



80. S. carillicollis n. sp. — Form moderately slender, sides parallel. 

 Pubescence rather short, coarse, close, sub-recumbent, dark fulvo-cinereous. 

 Head moderate, twice as wide as long ; interocular surface nearly flat, two 

 and one-half times as wide as the eye ; longitudinal sulcations very deep and 

 conspicuous ; intermediate surface narrower than the lateral portions, strongly 

 and evenly convex ; punctures rounded, fine, very closely crowded, some- 

 what confused ; ocular lines meeting at somewhat more than one length in 

 advance ; antennae very slightly longer than the width of head, moderately 

 slender, piceous-black, club distinct ; third joint one-fourth as long again 

 as the fourth, fourth just perceptibly longer than the fifth, seventh much 

 shorter than the sixth and slightly longer, though scarcely more slender 

 than the eighth, eighth slightly shorter than the seventh and no thicker, 

 sub-cylindrical, joints of club increasing rather rapidly in length. Prothorax 

 arcuately, evenly, and rapidly increasing in width to the middle, where it is 

 three-fourths as wide as the head, and distinctly narrower than long ; sides 



