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 information 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, TYash., 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, Rock 



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 



