79 



B A stouter species, the strial punctures coarse, the striae wider than the 



interspaces, which are finely granulate and finely uniseriately 



tuberculate. Fla., Va., N. Car. tenuis Eichh. 



BB Distinctly more slender; the strial punctures moderate, narrower 



than the densely rugose more hairy interspaces. Fla., N. Car. 



exilis Chap. 



Hylastes porculus Erichson; Wieg. Archiv. 2: 49, 1836; Eichhoff and Schwarz, 

 Proc. U.S. Nat. Mus. 16: 606, 1896. 



A black species; length, 4-5 mm. The last ventral of the male 

 impressed and pubescent on the middle line behind. The only species of 

 the genus found in Eastern Canada. (PL 21, fig. 2). 

 Host trees. Pines. 



Distribution. Eastern United States, from Maryland to Maine and 

 Michigan; and Eastern Canada, west to Manitoba. Rare in Canada. 



Hylastes nigrinus Mannh.; Bull. Mosc., 356, 385, (Hylurgus), 1852. 



A black species; length, 4 mm. to 5 mm. The last ventral of the male 

 more broadly rounded, with a densely punctured and pubescent, broad, 

 median caudal impression. The common species of the genus in the southern 

 interior and coast regions of British Columbia. 



Host trees. Douglas Fir, less commonly in Western White Pine and 

 Western Hemlock, and probably other conifers. 



Distribution. The Rocky Mountain and Pacific Coast regions from 

 Alaska to California. 



Hylastes ruber Sw.; Can. Ent., 47: 367, 1916. 

 A red species; length, 5 mm. Rare. 

 Host tree. Douglas Fir. 



Distribution. Southern interior of British Columbia; Golden, Creighton 

 Valley. 



Hylastes macer Lee.; Am. Ent. Soc. Trans., 2: 175, 1868. 



A black, elongate species; length, 5 to 6 mm. The last ventral of the 

 male impressed and pubescent behind. Entirely distinct in our fauna. 



Host tree. Engelmann's Spruce (in litt.). 



Distribution. Very rare in the southern interior of British Columbia, 

 taken at Vernon and Kaslo; California, Nevada (our coll.), Utah, Nebraska 

 (in litt.). 



Hylastes longicollis n. sp. 



Description of adult: Allied to gracilis Lee., but with the pronotum 

 much narrower, the strial punctures much coarser, and more distinctly 

 hairy; length, 3-9 mm.; width, 1-3 mm. A female. 



The head is much as in gracilis, but more coarsely granulate-punctate, 

 and abundantly clothed with rather short reclining hairs above, and denser, 

 longer hairs below, with a few longest and erect; the basal segment of the 

 antennal club comprising nearly two-thirds the mass; the beak widened 

 at the tip; the transverse impression stronger at the middle; the carina 

 well developed; the epistoma not much impressed and coarsely granulate. 

 The pronotum is much narrower than in gracilis, one-sixth longer than 

 wide; very much narrower than the elytra; the sides straight behind, diver- 

 gent to the widest point just before the middle, then arcuately narrowed 

 to the very broadly rounded front margin; the hind margin nearly straight; 

 the disc evenly, very coarsely and densely punctured, more finely in front 

 and on the sides, not much roughened; with a long narrow, well developed 

 median carina. The elytra are nearly straight at the base; with the sides 

 straight for over two-thirds the length, then very strongly narrowed to the 

 narrow but broadly rounded hind margin, as seen from above; the striae 

 moderately impressed, faintly on the sides, with the strial margins unusually 



