56 



arranged transversely on the middle line, impressed in front of the tubercles 

 (PL 21, fig. 1). 



Host trees. — Spruces, Larch, and rarely in Pine, 



Distribution. — Abundant throughout the spruce forests of Canada 

 and the northern United States from the Pacific coast of Alaska east to New- 

 foundland. 



It is found everywhere in dying spruce bark, but frequently becomes 

 a more or less important primary enemy to black and white spruce. 



Kirby's type of rufi'pennis was compared with our material by my as- 

 sistant, Mr. R. N. Chrystal, and found to be the same. Kirby's nigriceps ap- 

 peared to differ only in having the head black with the pronotum and elytra 

 light red. Mr. Chrystal examined Kirby's type of hrevicornis, but found it 

 unrecognisable; only one elytron was present and the abdomen was badly shat- 

 tered. The following notes were made from it: " Stout, cylindric, clothed 

 with scales, black with the elytra very dark piceous, the front flat, without 

 tubercles, the elytral striae almost invisible, the surface rougher than rufi'pennis, 

 more coarsely punctured; a female; the antennal club thicker and more knob- 

 like than in ruiipennis." Probably this name should be disregarded. 



The Genus Carphoborus Eichhoff. 

 Berl. Ent. Zeitschr., 8:27, 1864. 



An undescribed species of this genus was collected by the Canadian Arctic Expedition on the 

 Coppermine River. It will be described in the Report of the Expedition. 



Key to the Species. 



A The declivital interspaces 1 and 3 moderately or feebly, subequally elevated; 

 the male with front concave, fringed with long yellow hairs. 

 B The declivital interspaces 1 and 3 feebly elevated and very feebly 

 serrate in the female, distinctly so in the male; the antennal club 

 nearly as wide as long, with the sutures strongly arcuate; pronotum 

 black, shining, and the elytral interspaces feebly granulate, with the 

 scales very minute, indistinct. California in Pinus ponderosa 

 and P. lamhertiana. simplex Lee. 



BB The declivital interspaces 1 and 3 moderately elevated and distinctly 

 serrate; the antennal club longer than wide, with the sutures nearly 

 straight; the pronotum more elongate, less than twice as wide as 

 long. 

 C The declivity moderately and subacutely serrate on the carinate 

 interspaces; the elytra reddish, the interspaces roughened, convex, 

 indistinctly clothed with very small yellowish scales not concealing 

 the surface; the female front with a blunt median tubercle sur- 

 mounting the convexity. Californa. radiatae, n. sp. Page 57. 



PLATE 12. 

 IPID BEETLES— All Greatly Enlarged. (Original.) 



Fig. 1, Dendroctonus valens Lee, The Red Turpentine Bark-beetle. 



Fig. 2, Dendroctonus pseudostsugoe Hopk., The Douglas Fir Bark-beetle 



Fig. 3, Dendroctonus hrevicornis Lee, Details of the elytra. 



Fig. 4, Dendroctonus obesus Lee, Details of the elytra. 



Fig. 5, Dendroctonus hrevicornis Lee, The Western Pine Bark-beetle. 



Fig. 6, Dendroctonus ohesus Lee, The Sitka Spruce Bark-beetle. 



