108 



E A smaller, slender species; the pronotum decidedly elongate^ 

 the discal interspaces 2, 3 and 4 impunctate on usually 

 the basal two-thirds, uniseriately punctured behind, but 

 little confused near the declivity. Southern States, north 

 to Massachusetts. (PI. 14, fig. 3). 



grandicollis Eichh. Page 113. 



EE Larger and stouter and more coarsely sculptured; the prono- 

 tum only moderately longer than wide, the discal inter- 

 spaces very sparsely punctured on the basal half, closely 

 punctured on the caudal half and decidedly confused 

 towards the declivity (PI. 17, fig. 2). Eastern Canada. 



chagnoni Sw. Page 113. 



DD The discal interspaces, 2, 3 and 4, punctured throughout, the 

 punctures uniseriate towards the base, more numerous and 

 densely confused behind the middle. Western species. 

 E The hinder half of the pronotum sparsely, rather finely punc- 

 tured on the disc, closely punctured on the sides; the 

 interstrial punctures of the elytra small, much smaller 

 than those of the striae, the first declivital tooth about as 

 near to the suture as to the second tooth; the declivital 

 face finely hairy. confusus Lee. Page 113. 



EE The hinder half of the pronotum closely coarsely punctured 

 on the disc, densely punctured on the sides; the interstrial 

 punctures more numerous and coarse, nearly as large as 

 those of the striae; the first declivital tooth placed very 

 close to the second and distant from the suture; the 

 declivital face coarsely densely hairy. 



Vancouver! Sw. Page 113. 

 BB The declivital margin with four declivital teeth; or, rarely, with only 



three declivital teeth. 

 C The third declivital tooth the longest, compressed, wide, emarginate 



at the tip. 



D The discal interspaces impunctate; the conical fourth tooth 

 usually obsolete (PL 13, figs. 1, 2). 



emarginatus Lee. Page 113. 



DD The discal interspaces closely, coarsely punctured; the fourth 



tooth normally present, between the third and the apical 



elevated margin. New Mexico. knausi Sw. 



CC The third tooth usually cylindric or conical, never flattened and 



emarginate at the tip. 



D The declivity nearly vertical, three teeth on each side, the third 

 tooth longest and the last, the second followed by an acute 

 ridge but not joined to the third; the epistoma deeply emar- 

 ginate in the male; the sutures of the club only faintly bisin- 

 uate ; the elytral punctures decreasing in size towards the base. 

 E The interstrial punctures of the elytra about as coarse as 

 those of the striae on the sides and on the caudal half of 

 the disc ; the pronotal punctures sparse ; the female with the 

 epistoma broadly emarginate. longidens Sw. Page 114. 



PLATE 25. 

 Ips pini Say, in white pine, the inner surface of the bark; about one-third natural size (Original). 



