110 



space wide behind, not punctured except at 

 the caudal extremity, so that the sutural 

 striae are not much widened behind. 



pini Say. Page 115. 



JJ The pronotum with sides straight and parallel 

 on the caudal three-fourths, the punctures 

 and asperities usually coarse; the elytral 

 strise usually impressed, the 2nd interspace 

 punctured on the caudal half making the 

 sutural striae evidently widened behind. 



laticollis, n. sp. Page 116. 



II The pronotum nearly or quite as wide as long; 

 the punctures of the discal striae but little 

 smaller towards the declivity; the sutural 

 strise always widened behind by punctuations 

 of the caudal half of the 2nd interspaces. 



J The pronotum widest at the base, faintly 

 arcuate on the sides, the punctures coarse 

 and the asperities more commonly sparse 

 and obtuse; the elytral striae usually dis- 

 tinctly impressed and the interspaces con- 

 vex, interpunctus Eichh. Page 116. 



JJ The pronotum with the sides parallel on more 

 than the caudal two-thirds, the punctures 

 usually small, and asperities usually small, 

 close and acute; the elytral striae hardly 

 impressed, except the sutural striae. 



oregoni Eichh. Page 117. 



FF All the interspaces punctured, uniseriately except near the 

 declivity. 



G The pronotum slender, distinctly longer than wide, 

 with the punctures nearly obsolete on the disc; 

 discal interspaces of the elytra very sparsely punc- 

 tured (PI. 14, figs. 5, 6). perroti Sw. Page 117. 



GG The pronotum hardly longer than wide, strongly 

 punctured on the disc; the discal interspaces with 

 numerous punctures. 



H The front of the head almost perfectly smooth and 



f^ 3 . 1 " polished, minutely and sparsely granulate and 



pubescent in the male, the epistomal region 

 never more than faintly elevated ; length usually 

 less than 4 mm. borealis Sw. Page 117. 



HH The front of the head densely or coarsely granulate 

 or distinctly elevated on the epistomal region; 

 the length usually more than 4 mm. 



I The front of the head evenly convex. 



J The punctures on the alternate interspaces of 

 the elytra decidedly confused towards the 

 declivity; the first two interspaces only 

 feebly granulate behind. 



hunteri Sw. Page 118. 



