The biology of the mountain pine beetle was studied in 1956 and 1957 near Invermere, in the East Kootenay region of British Columbia. The host tree was lodgepole pine (Pinus contorta var. latifolia Engelm.). The technique used permitted direct observation of mating, egg laying, and gallery construction. The sex ratio was also investigated under natural conditions and in cages. The most important previous work on the biology of this insect was done by De Leon, Bedard, and Terrell (1934).
(Received February 24 1958)
1 Contribution No. 452, Forest Biology Division, Science Service, Department of Agriculture, Ottawa, Canada.
2 Forest Biology Laboratory, Calgary, Alberta.