26 



INJURIES TO WESTERN WHITE PINE. 



The mountain pine, or western white pine, Pinus monticola, occurs in British 

 Columbia from the valley of the Columbia river to Vancouver Island. It is 

 subject to attack from several species of bark-beetles; and one, the Mountain 

 Pine Bark-beetle, or Western White Pine Bark-beetle (Dendroctonus monticolae 

 Hopk.), is particularly destructive both in the Interior and on Vancouver island. 



THE WESTERN WHITE PINE BARK-BEETLE (Dendroctonus monticolae Hopk). 



This species probably occurs throughout the range of the white pine in 

 British Columbia. It was found this summer killing white pine timber in the 

 Sugar Lake region, at Cowichan Lake, and about Seymour Narrows and Camp- 

 bell River. It has already been referred to in connection with the injury to bull 

 pine. 



Fig. 12 The Western White Pine Bark-beetle. 



(Dendroctonus monticolae Hopk). 



Greatly enlarged. (Original). 



It is a cylindric black, rather stout beetle, somewhat larger than the Western 

 Pine Bark-Beetle, ranging from 4 mm. to 6 . 5 mm., (one-eighth to one-quarter of 

 an inch) in length, with the pronotum wider than long, distinctly narrower in 

 front, punctured and hairy on the sides and above; the elytra with striae of 

 medium-sized punctures, the interspaces roughened, sparsely clothed with short 

 hairs and with scattered long hairs behind. It is distinguished from the Western 

 Pine Bark-Beetle by its larger size (usually), the wider pronotum narrower in 

 front, the long hairs of the sides and hinder part of the elytra, and by the different 

 shape of the egg-tunnels. 



