79 



B A stouter species, the strial punctures coarse, the striee 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. (PI. 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 longicoUis 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 



