THE GENUS DENDROCTONUS. 



89 



water. Scorching the bark or burning the timber outright, or utiliz- 

 ing it and burning the slabs, may answer the same purpose. It is 

 quite evident that if the infested lodgepole pine be cut in the period 

 from September to February, and the trunks, logs, or trees with 

 infested bark on them crib-piled in the open, the bark will dry 

 sufficiently to kill the broods before they can develop and emerge. 

 Hacking or scoring the bark on the upper side of the logs or felled 

 trunks of the silver pine or sugar pine during December, to let the 

 water in, would doubtless kill the majority of the broods before 

 the time for them to emerge. These suggestions relating to methods 

 of treating unbarked timber should be tried by the foresters and 

 lumbermen and the practical results reported, as should all practical 

 results from the adoption of our recommendations. Failures, as 

 well as successes, should be reported. 



Fig. 50.— The mountain pine beetle: Distribution map. (Author's illustration.) 



BASIS OF INFORMATION. 



Information concerning this species is based on studies by the writer 

 at Grants Pass, Oregon, and Sand Point and Kootenai, Idaho, in 

 1899; at Priest River, Idaho, in 1902, and in the Yosemite National 

 Park and Yosemite Valley, California, June, 1904; by Mr. J. L.Webb, 

 at Moscow, Idaho, in 1900; at Centerville, Smith's Ferry, and Collins, 

 and in Boise County, Idaho, June to September, 1905; by Mr. H. E. 

 Burke, at Smith's Ferry, Idaho, October, 1904; at Longmires Springs, 

 Wash., September, 1905; at Wawona, Summerdale, Little Yosemite, 

 Yosemite, Lake Tenaya, Tioga Road, and Soda Springs, Cal., May 

 to September, 1906, and at Joseph, Oregon, and in the Wallowa 

 National Forest, August, 1907. Additional localities, from other 



