COLEOPTERA. 133 



Elytral suture not more than one-fourth longer tlian the pronotum. 

 Coalescent punctures of elytra forming long tortuous channels. 

 Base and apex of prothorax equal or sub-equal in length. 

 Prothorax widest at the middle. 



Sides of elytra strongly arcuate 117. vestalis. 



Sides of elytra nearly straight 118. tahoensis. 



Prothorax widest behind the middle 119. 11 ill! bostis. 



Prothorax widest before the middle 120. pugetensis. 



Apex of prothorax longer than the base 



Under surface of the abdomen polished, minutely and distantly 



punctulate 121. vacuus. 



Under surface of the abdomen coarsely and closely punctulate, 



interspaces granulose and feebly shining 122. amicus. 



Punctures of elytra not coalescent in long and tortuous channels, 



and not joined in sets of more than two or three 123. exilis. 



Elytral suture two-thirds longer than the pronotum. 



124. califoniicus. 



112. S. gra t iosus n. sp. — Form very robust. Pubescence long, dense, 

 rather coarse, sub-recumbent, cinereous. Head small, very short, much 

 more than twice as wide as long ; interocular surface twice as wide as the 

 eye, convex ; sulcations feeble, rounded ; intermediate surface very strongly 

 and somewhat acutely convex, conspicuous ; punctures very closely crowded, 

 irregularly polygonal, very coarse; ocular lines meeting at two lengths in 

 advance; antennae slightly longer than the width of head, robust, dark 

 piceous-brown, darker toward the base, club large ; third joint one-fourth as 

 long again as the fourth, joints four to seven uniformly and very gradually 

 decreasing in length ; seventh slightly thicker than the sixth, eighth one- 

 half longer than wide, as thick as the seventh, joints of club increasing 

 uniformly and rapidly in length and thickness ; maxillary palpi somewhat 

 short and robust, dark piceous-black, first joint translucent, dark piceo- 

 testaceous. Prothorax robust, arcuately, evenly, and rapidly increasing in 

 width to a point distinctly in advance of the middle, where it is five-sixths as 

 wide as the head, and as wide as long ; sides thence rather rapidly convergent 

 and distinctly sinuate ; anterior margin slightlv shorter and more arcuate 

 than the posterior ; surface very feebly tuberculate near the basal angles ; 

 coarsely, rather closely, and evenly punctate ; punctures round, deeply 

 impressed ; interspaces one-half as wide as the punctures, convex, highly 

 polished. Elytra at base as wide as the head; sides rather strongly diver- 

 gent posteriorly, equal in length to the width at base, moderately arcuate, 

 strongly so toward the apices ; together broadly, roundly, and strongly emar- 

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

 strongly convex, very feebly and narrowly impressed on the suture at the 

 base ; coarsely, rather closely, and evenly punctate ; interspaces one-half as 

 wide as the punctures, convex, highly polished. Abdominal segments de- 

 creasing uniformly and rather rapidly in width, first slightly narrower than 

 the contiguous elytra ; surface very convex, coarsely, closely, and evenly 

 punctulate, highly polished ; transverse carinae 4-cuspid, cusps equal in 



