552 EXPERIMENT STATION RECORD. 



This is a report of a survey made durinj; the summer of 1913 with the view of 

 determining the location and extent of the chief forest insect injuries, and 

 to decide upon proper control measures for the more serious outbreaks. But 

 a small portion of the southern part of the forest area of British Columbia 

 could be covered. 



The bull pine, or western yellow pine (Pinus ponderosa), occurs in British 

 Columbia only in the southern part of the interior. It is subject to attack 

 throughout its range In British Columbia by three destructive si^ecies of bark 

 beetles, viz, the western pine bark beetle (Dcndroctonus brevicomis), the 

 western white pine, or mountaiij pine bark beetle (D. monticolm), and the 

 red turpentine bark beetle (D. valens), and by a number of pests of lesser 

 importance. The most important and extensive injury was found to occur 

 about Princeton, in the southwest portion of the bull-pine area. 



The mountain pine, or western white pine {P. 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, D. montkolw being 

 particularly destructive in the interior and on Vancouver Island. 



The lodgepole or black pine (P. murrayana) occurs throughout the interior 

 of British Columbia and is subject to attack by D. monticolw and D. murray- 

 cnnce, and by a number of species of secondary importance. 



The Douglas fir (Pseudotsuga mucronata) extends over a very wide area 

 in the southern half of British Columbia, from the eastern foot-hills of the 

 Rockies to the coast and Vancouver Islands, with a very irregular northern 

 and northwestern limit ; in the area covered by the sun-ey there was no very 

 extensive insect injuries found. The Douglas fir bark beetle (Z). pseudotsugce) 

 is thought to be the most serious enemy and a number of other species are 

 important secondary enemies. 



The Sitka spruce occurs In British Columbia throughout the coast region 

 and on Vancouver Island. Its most injurious insect enemies are the Sitka 

 spruce bark beetle (D. oJ)Csus) and the western spruce gall louse. 



Brief accounts are given of the ambrosia beetles, also known as timber 

 beetles or pin-hole borers, of which the two most important on conifers are 

 Gnat hot richus rctusus and G. sulcatus, and of the Pacific Coast timber beetle, 

 Platypus sp., which is abundant on the coast and island. Brief mention is 

 made of the larger wood borers of the families Cerambycidre and Buprestidae. 



Accounts of the life history, habits, and injury of, and control measures for 

 the most important species discussed in the bulletin are included. A map, 

 showing the limits of forest trees in southern British Columbia, is added. 



Concerning infection through, insects, T. A. Venema {Hyg. Rundschau, 24 

 il91-i), No. 20, pp. 1073-10S.3). — A summarized account of the transmission of 

 disease organisms by insects. 



Transmission of disease by native bloodsucking insects, A. Schitberg and 

 W. BoiNG (Arb. K. Gsndhtsamt., 47 {1914), No. 3, pp. 491-512, fig. 1; ahs. in 

 Rev. Appl. Ent., 2 {1914), Sei: B, No. 11, p. i69).— This third paper (E. S. R., 

 28, p. 756) deals with the experimental transmission of anthrax and of strep- 

 tococci to the sheep and goat by the stable fly {Stomojcys colcitrans), a brief 

 account of which has been previously noted from another source (E. S. R., 29, 

 p. 760). 



A contribution to the biology of sewage disposal, J. W. H. Johnson {Jour. 

 Econ. Biol., 9 {1914), ^'os. 3, pp. 105-124; 4- PP- 127-164, figs. .33).— In the course 

 of this discourse the author deals at some length with the sewage fly or moth 

 fly (pp. 136-143). particularly Psychoda phala^noides and P. sexpunctata; and 

 the water spring tail {Achorutes viaticus) (pp. 143-149), "Where circumstances 



