56 



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

 (PI. 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 rufipennis 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 brevicornis, 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 rufipennis, 

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

 like than in rufipennis." 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. lambertiana. 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 pseudostsugce Hopk., The Douglas Fir Bark-beetle 



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



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



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



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



