130 



declivity strongly flattened, with the first two striae impressed 

 (PI. 11, fig. 5). betulae Hopk. Page 131. 



BB The ventral surface finely punctate; the pronotum widest well behind 

 the middle and much more strongly narrowed in front than behind; 

 the interstrial punctures of the elytra at least nearly as coarse and 

 numerous as those of the striae; the antennal club with the basal 

 corneous part as long as or longer than wide, with the apical pubescent 

 surface only slightly convex, and hardly projecting beyond the distal 

 margin of the basal part. 



C The elytral interspaces confusedly punctured on the disc and sides; 

 the frontal hairs of the female straight, rather short, and forming 

 an extremely dense brush almost completely hiding the surface; 

 the interstrial punctures evidently smaller than those of the striae, 

 particularly on the sides; the size large, length about 4 mm. 



confusus Sw. Page 131. 



CC The elytral interspaces rather regularly uniseriately punctured; the 

 interstrial punctures practically as large and numerous as those 

 of the striae on the disc and sides; the front of the female very 

 closely hairy, but with the hairs long and rather uneven, not in a 

 dense brush, and not concealing the surface at the middle line; 

 length, 3 • 2 mm. or less. 



D The punctures on the declivity as coarse in both sexes as those 

 on the disc. pubescens Sw. Page 132. 



DD The punctures of the declivital striae and interspaces much 

 smaller and sparser in the male, and in both sexes distinctly 

 smaller than those of the disc (PI. 11, fig. 3). 



aflfaber Mannh. Page 132. 



The eastern race has a slightly smaller average size; from 

 Manitoba eastward to the Atlantic coast. 



piceae Hopk. 



Dryocoetes sechelti Sw.; Can. Ent., 47: 358, 1915. 



It is known to us only by a series sent from Sechelt, B.C., by the late 

 Tom Wilson. 



Dryocoetes granicoUis Lee; Am. Ent. Soc. Trans., 2: 162, 1868 (Xylehorus). 

 It is known to us only by the specimens in the Leconte collection. 



Dryocoetes pseudotsugae Sw.; Can. Ent.; 47: 360, 1915. 



The length varies from 3-5 mm. to 4-9 mm., with very few less than 

 4 mm. The pronotal punctures and asperities are small and dense; the 

 strial punctures of the elytra usually small; the declivity is sometimes less 

 flattened than usual, and the discal interspaces rarely with the punctures 

 confused at the base and towards the declivity only; such variations could 

 easily be mistaken for septentrionis. The male has the front very wide, 

 strongly granulate, with a broad, shining, transverse impression; the front 

 of the female is moderately wide, less shining, the declivity less strongly 

 flattened; the front in both sexes is clothed with rather abundant long 

 hairs (PI. 11, fig. 4). 



Host trees. — Douglas Fir. It may occur also in Balsam and Spruce. 



Distribution. — Very abundant in the coast region of British Columbia, 

 probably throughout the range of its host tree in that province, southward 

 to Oregon. 



