129 



B The declivity flat, with the 2nd striae also distinctly impressed; the 

 form moderately stout, 2-5 times as long as wide, the pronotum as 

 wide as long and strongly convex. British Columbia. 



sechelti Sw. Page 130. 



BB The declivity convex, the 2nd striae there hardly impressed ; the strial 

 punctures on the declivity as coarse as on the disc; the form more 

 elongate; the pronotum longer than wide. Pennsylvania. 



granicollis Lee. Page 130. 



AA The sutural striae not very widely and deeply impressed on either disc or 



declivity; larger species, usually well over 2 mm. long. 

 B The ventral surface with coarse, round, shallow punctures; the pronotum 

 widest usually at or near the middle, the interstrial punctures of the 

 elytra much smaller and sparser than those of the striae; the antennal 

 club with the basal corneous part usually evidently wider than long, 

 the pubescent apical surface projecting beyond the distal margin of 

 the basal corneous part. 



C The female with the front only sparsely hairy; the pronotum with 

 the punctures more or less obscured by the asperities on the 

 frontal half, but distinct from the base to considerably beyond 

 the middle, variably but distinctly punctured, and finely granulate 

 to moderately asperate on the sides behind; the declivity convex 

 or rather strongly flattened. 



D The declivity evidently flattened, with the 2nd interspace 

 impressed; the odd interspaces of the elytral disc wider and 

 confusedly punctured from the top of the declivity usually 

 to the base, with the strial punctures usually rather small; the 

 pronotum with punctures of varying size, large, usually as 

 wide as the elytra, with the sides frequently nearly parallel 

 on the median third, broadly rounded on the front margin 

 (PI. 11, fig. 4). pseudotsugae Sw. Page 130. 



DD The declivity convex (rarely slightly flattened in septentrionis) ; 

 the elytral interspaces rather regularly and uniseriately punc- 

 tured (frequently somewhat confused near the declivity in 

 septentrionis) . 



E The pronotum large, usually as wide as the elytra, sides 

 usually subparallel on the median third, feebly rounded 

 behind, a little more strongly in front and broadly rounded 

 on the front margin; the strial punctures of the elytra 

 usually coarse, the striae evidently impressed on the disc 

 and declivity, and as wide as the rather narrow interspaces, 

 length usually less than 4 mm. Eastern America. 



americanus Hopk. Page 131. 



EE The pronotum apparently rather small, usually narrower 

 than the elytra, very strongly arcuate on the sides, strongly 

 narrowed behind, more strongly in front, narrowly rounded 

 on the front margin; the strial punctures of the elytra 

 usually rather small, the striae faintly impressed, the inter- 

 spaces wide, the length usually more than 4 mm. 

 Northern Alberta to Alaska. 



septentrionis Mannh. Page 131; 



CC The females with the front densely pubescent with long reddish- 

 yellow hairs; the pronotum with the punctures on the frontal half 

 almost entirely obscured by the asperities, and considerably 

 obscured by the strongly developed asperities on the sides; the 

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