61 



C The pronotum finely, closely punctured, more finely, densely, 



and regularly on the middle of the sides behind; the epistomal 



process usually projecting slightly beyond the epistomal margin. 



British Columbia. pseudotsugae Hopk. Page 62. 



CC The pronotum coarsely, rather sparsely punctured; not more 



densely and regularly on the middle of the sides behind; the 



epistomal process not projecting beyond the epistomal margin. 



In Eastern Larch. simplex Lee. Page 62. 



BB The epistomal process wide, with the sides strongly oblique, the cephalic 



margin of the process concave, with the angles more or less evidently 



tuberculate, shorter than the epistoma. 



C The punctures of the pronotum large and shallow, disclosing the 

 bottom, fairly regular in size, without very small punctures 

 intermixed; the front without a median, posterior impression; 

 large species, 5 to 9 mm. 



D The pronotal punctures only moderately coarse and shallow, 

 and closely placed; the colour usually yellowish brown to 

 dark reddish brown, rarely very dark piceous or black; 

 the epistomal process usually with the oblique sides long so 

 that the process is notably wide. valens Lee. Page 63. 



DD The pronotal punctures very large, very shallow, and rather 

 sparse; the colour usually dark piceous or black; the epistomal 

 process with the sides short, and the angles usually more 

 strongly tuberculate. The Southern States, north to New 

 Hampshire. terebrans Oliv. Page 64. 



CC The punctures of the pronotum deep and small, more or less 

 evidently intermixed with larger punctures; the front impressed 

 on the median line towards the vertex. 



D The caudal half of the proepisternal area distinctly punctured. 

 E The declivital striae coarsely punctured. 



punctatus Lee. Page 65. 



EE The declivital striae finely punctured. 



F The caudal half of the proepisternal area rather closely 

 punctured and strongly roughened; the declivital inter- 

 spaces strongly punctured ; the basal crenulations of the 

 elytra slightly separated, hardly overlapping. 



murrayanae Hopk. Page 64. 



FF The caudal half of the proepisternal area rather sparsely 

 punctured and only feebly roughened; the declivital 

 interspaces feebly punctured; the basal crenulations 

 of the elytra close and overlapped. 



rufipennis Kirby. Page 64. 



DD The caudal half of the proepisternal area granulate, with the 



punctures indistinct. 



E The pronotum as wide as the elytra; the punctures of the 

 pronotum small and moderately regular in size. 



monticolae Hopk. Page 65. 



EE The pronotum slightly but distinctly narrower than the 



elytra; the pronotal punctures decidedly irregular in size. 



F The punctures of the discal strise of the eltyra frequently 



small and deep; Alaska, the Yukon, British Columbia 



and Alberta, in White and Engelmann's Spruce. 



borealis Hopk. Page 66. 



