THE GENUS DENDROCTONUS. 
113 
regulations certain provisions for the burning of the slash, this work 
should be done during the period beginning about the first of October 
and ending by the first of March. 
BASIS OF INFORMATION. 
The informatio'n relative to this beetle is based on investigations 
conducted by the writer at Guerneville and McCloud, Cal., Grants 
Pass, Corvallis, Newport, Detroit, and St. Helen, Oreg., Port 
Angeles and Port Williams, Wash., Sand Point, Kootenai, and 
Hailey, Idaho, April and June, 1900; at Kootenai, Idaho, and Junc- 
tion, Wash., August, 1902; at Tercio, Colo., and Fieldbrook, Cal., 
May, 1903; at Colorado Springs, Colo., October, 1905, and at Fort 
Garland, Colo., in 1906; by Mr. H, E. Burke, at New London, Eock 
Fig. 69. — The Douglas fir beetle: Distribution map. (Author's illustration.) 
Creek, Kent, Satsop, Hoquiam, North Bend, Pialschie, Des Moines, 
Ashford, and Meredith, Wash., May to October, 1903, June to Sep- 
tember, 1904, May to September, 1905, and April and May, 1906; 
at Smiths Ferry, Idaho, October, 1904; in San Mateo County, Cal., 
May, 1906; at Panguitch and Panguitch Lake, Utah, July to Sep- 
tember, 1907; by Mr. J. L. Webb, in the San Francisco Mountains, 
Arizona, June, 1904; at Centerville, Stites, Kooskia, and Pioneerville, 
Idaho, from June to September, 1905; in the Chiricahua National 
Forest, and the Sacramento National Forest, Arizona, June to Sep- 
tember, 1907; by Mr. W. F. Fiske, at Capitan and Cloudcroft, N. 
Mex., March to June, 1907. Additional localities through corre- 
spondence and from other collections are Belton, Ovondo, Bozeman, 
Kalispell, and Leavenworth Valley, Mont. ; Orting and Dole, Wash. ; 
89535— Bull. 83, pt. 1—09 9 
