75 



CC The vestiture of the pronotum of intermixed scales and hairs; the 

 elytra densely scaly; the interspaces nearly flat, the striae narrow, 

 with small punctures; the- sides of the elytra parallel on the basal 

 half; the pronotum with shallow punctures, the scales of the 

 pronotum abundant on the disc. 



D The scales of the elytra elongate and subacuminate at the apex. 



Sitka spruce. sitchensis Sw. Page 76. 



DD The scales of the elytra but little longer than wide, broadly 



rounded at the apex, smaller and more slender towards the 



base in the female of grandis (PI. 21, fig. 5). 



E A moderately stout species with the interstrial hairs of 



moderate length; the basal teeth of the elytra closely 



placed and crescentic. Grand Fir and Douglas Fir. 



grandis Sw. Page 76. 



EE A more slender species with much longer elytral hairs; 



the basal teeth of the elytra isolated and acute towards 



the sides. Shore Pine. sericeus Mannh. Page 76, 



AA The segments of the antennal club subequal in length, the first hardly 



longer than the second; the basal margin of the elytra with isolated, 



acute, well developed teeth towards the sides. The ninth interspace 



strongly acutely serrate about the sides of the declivity; the elytral 



vestiture of small subcircular scales. nebulosus Lee. Page 75. 



Pseudohylesinus nebulosus Lee; Acad. Nat. Sci. Phil. Proc, 285 (Hylesinus) , 

 1859. 



A slender species, with strong colour-markings in dark and light 

 reddish-brown; the male very densely clothed with stout scales; the epis- 

 tomal lobe strongly developed; length, 2-8 mm.; width, 1-2 mm. The 

 supposed female has interspace 9 on the declivity less strongly serrate, and 

 the elytral scales decidedly elongate and becoming plumose towards the 

 base. This species should properly form the type of a separate genus. 



Host tree. — Douglas Fir. 



Distribution. — Southern British Columbia, south to California. Usually 

 a secondary enemy. 



Pseudohylesinus granulatus Lee; Am. Ent. Soc. Trans. 2: 175, 1868. 



A large species; length, 5-5 mm.; the beak carinate; the antennal club 

 only slightly compressed, the 1st segment as long as 2nd and 3rd together; 

 the pronotum narrower than the elytra and moderately constricted in front 

 in the female, nearly as wide as the elytra and strongly constricted in front 

 in the male; the elytral striae impressed, with coarse punctures; the inter- 

 spaces strongly convex behind; the pubescence stout on the pronotum, 

 scaly on the elytra, with scattered light-coloured patches; the scales small 

 and frequently almost entirely abraded. 



Host tree. — Grand Fir. 



Distribution. — Nanaimo, Eberts, and Campbell River, in British Colum- 

 bia, and probably more widely distributed. Recorded also from Washing- 

 ton, Oregon, and California. 



Usually a secondary enemy. 



Pseudohylesinus tsugae Sw.; Dom. Ent. Br., Dept. Agric, Bull. 14: 11, 1917. 

 A stout species of moderate size and reddish-brown colour, sparsely 

 clothed with short stout hairs, with tufted hairs on the sides and narrow 

 scales on the declivity. Distinct from granulatus Lee, in the decidedly 

 stouter form, much less densely and less strongly roughened pronotum, and 

 the sparser elytral vestiture which becomes tufted on the sides; granulatus 



