COLEOPTERA. 131 



punctures, sinning. Elytra at base somewhat narrower than the head : 

 together deeply emarginate at the base, broadly and more feebly so poste- 

 riorly ; sides rather strongly divergent, arcuate; suture one-eighth as long 

 again as the pronotum ; surface convex, impressed along the suture, evenly 

 punctate; punctures impressed; interspaces about equal in width to the 

 punctures. First four abdominal segments equal in width, as wide as the 

 contiguous elytra ; border well marked; surface somewhat closely and very 

 finely punctulate, shining; transverse carinae not cusped. Legs rather 

 slender, piceous-black ; first joint of the posterior tarsi equal in length to 

 twice the second. Under surface black, shining. 



Male. — Posterior edge of the fifth ventral segment very broadly and feebly 

 sinuate; sixth broadly sinuate at apex, depth of sinus equal to one-third its 

 width, rather acutely rounded at the bottom. 



Female. — Sixth segment broadly and evenly rounded behind. 



Length 2.6-2.9 mm. 



Detroit, Michigan, 15. 



This species greatly resembles subyriseus, from which it differs in 

 the nature and punctuation of the interocular surface, and notably in 

 the structure of the prothorax, the transverse depression in the sur- 

 face just behind the anterior margin being entirely absent in subgri- 

 schs, and the punctuation being much more distant and less variolate 

 in the latter; the length of the pronotum is also less. The punctua- 

 tion of the. abdomen is much closer in indistinctus. The sexual 

 characters are quite similar. Many of the specimens were taken in 

 mid-winter. 



111. S. l>riimalis n. sp. — Form moderately elongated. Pubescence of 

 entire body long and abundant; pale fusco-cinereous in color on the head, 

 pronotum, and elytra, cinereous, and more dense on the abdomen. Head 

 moderate, slightly more than twice as wide as long ; interocular surface 

 about twice the width of the eye, very slightly excavated and closely punc- 

 tate ; punctures not coalescent ; longitudinal elevation well marked, carini- 

 form ; ocular lines meeting at about one and one-half lengths in advance; 

 antennae rather short and stout, densely and coarsely setigerous, dark 

 piceous-brown, about equal in length to the width of head; third joint but 

 slightly longer than the fourth, three to six gradually decreasing in length, 

 ten and eleven much longer and thicker than the ninth. Prothorax widest 

 at the middle, where it is nearly as wide as long ; sides thence gradually 

 convergent posteriorly and slightly sinuate ; anterior and posterior margins 

 slightly arcuate and nearly equal in length ; surface evenly convex, closely 

 punctate; interspaces rather less in width than the punctures, shining. 

 Elytra at base about equal in width to the head ; together broadly and evenly 

 emarginate at the base and apex ; sides almost imperceptibly divergent, 

 arcuate ; suture one-fourth as long again as the pronotum ; surface unevenly 

 convex, rather closely and finely punctate ; interspaces about equal in width 

 to the punctures, highly polished. Abdominal segments decreasing rather 



