COLEOPTEKA. 119 



as wide as the eye ; coarsely, closely, and sub-variolately punctate ; longi- 

 tudinal elevation moderately developed ; ocular lines meeting at three Lengths 

 in advance ; antennae slender, much longer than the width of head, dark 

 piceous, club distinct and paler in color ; third joint one-half as long again 

 as the fourth, fourth and fifth equal, also the sixth and seventh, joints of 

 club gradually increasing in thickness and length ; maxillary palpi uniformly 

 dark piceous. Prothorax robust, widest at the middle, where it is just per- 

 ceptibly narrower than long and but little wider than the interocular surface ; 

 sides thence feebly convergent posteriorly and very slightly sinuate ; surface 

 evenly convex, rather evenly punctured ; punctures sub-variolate and shal- 

 low, wider than the interspaces which are moderately shining ; anterior and 

 posterior margins equal in length, the former slightly the more arcuate. 

 Elytra at base as wide as the head ; sides very slightly divergent and arcuate ; 

 together broadly and distinctly emarginate behind ; suture one-sixth as long 

 again as the pronot'um ; surface strongly and evenly convex, very evenly 

 punctate ; punctures sub-variolate, shallow, broader than the interspaces, 

 which exhibit a minutely granular texture. Abdominal segments decreas- 

 ing regularly and rather rapidly in width, first distinctly narrower than the 

 contiguous elytra ; surface convex, minutely granulate, finely punctulate ; 

 border rather narrow ; transverse carina 4-cuspid, cusps extremely short, 

 rudimentary, and expanded toward tip, Legs dark brownish-piceous, mode- 

 rate in length, joints of tarsi cylindrical ; first joint of posterior one-half as 

 long again as the second, next three uniformly decreasing in length. Under 

 surface of the abdomen minutely granulate and finely punctulate. 



Male. — Surface of fifth ventral segment feebly impressed in the middle 

 fourth of its posterior half, coarsely pubescent, posterior edge broadly and 

 almost imperceptibly emarginate; sixth segment broadly truncate at tip; 

 seventh bearing at apex two well-marked lateral teeth, and upon each a long 

 coarse seta, longer than the breadth at tip. 



Female. — Unknown. 



Length 2.3 mm. 



Detroit, Michigan, 2. 



The sexual characters in this species are very feebly developed. 



96. S. rigidus n. sp.— Form moderately robust. Pubescence cinereous, 

 rather short, and moderately close, nearly uniform throughout. Head 

 moderate, more than twice as wide as long ; interocular surface flat, two 

 and one-half times as wide as the eye, evenly and rather closely punctate : 

 longitudinal elevation rather prominent, raised above the general level of 

 the eyes ; ocular lines meeting at about two lengths in advance ; antennae 

 nearly black, coarsely setose, rather slender, a little longer than the width 

 of head, club distinct ; third joint one-third as long again as the fourth, 

 joints three to seven gradually decreasing in length, ten and eleven nearly 

 equal, much thicker and longer than the ninth; first joint of tin* maxillary 

 palpi flavo-testaceous, next two nearly black. Prothorax three-fourths as long 

 again as the head, widest a little before the middle ; sides thence gradually 

 convergent posteriorly and very feebly sinuate ; anterior and posterior mar- 

 gins equal in length, equally and rather strongly arcuate ; length but slightly 



