THE GENUS DENDROCTONUS. 
131 
Mr. W. F. Fiske, of this Bureau, who was sent to investigate the 
conditions as to insect ravages in the White Mountains of the Lincoln 
National Forest, reported that during his investigations in May, 1907, 
he found that at least 95 per cent of all of the Engelmann spruce out- 
side of the burned areas was beetle-killed, but that practically all of 
this was rather old work and that there was very little evidence of the 
beetles' presence at that time. 
Mr. J. L. Webb, of this Bureau, visited the same area in September 
and estimated that fire had killed about 15 per cent of the total stand 
of spruce, and that the beetle has killed about 90 per cent of the 
remainder. 
METHODS OF CONTROL. 
The methods of controlling this beetle are essentially the same as 
for the eastern spruce beetle. 
Fig. 82. — The Engelmann spruce beetle: Distribution map. (Author's illustration.) 
BASIS OF INFORMATION. 
Information concerning this barkbeetle is based on investigations 
by the writer at Boulder, Colo., August, 1901; at Black Hills, S. 
Dak., September, 1901, and August, 1902, and in the Pike National 
Forest, Colo., October, 1905; by Mr. J. L. Webb, at Collins, Idaho, 
September, 1900; in the Black Hills, S. Dak., June and October, 1902, 
and August, 1906; in the Rincon Mountains, Ariz., and in the Capi- 
tan Mountains and at Cloudcroft, N. Mex., from May to Septem- 
ber, 1907; by Mr. W. F. Fiske, in the Capitan Mountains, N. Mex., 
May, 1907; by Mr. W. D. Edmonston, in the Ouray National Forest, at 
Craig, Steamboat Springs, and Hahns Peak, in the White River 
