52 
THE SCOLYTID BEETLES. 
BASIS OF INFORMATION. 
Information on this species is based on investigations by the writer 
at Williams, Ariz., September, 1902, at Vermejo, N. Mex., May, 1903, 
and near Flagstaff, Ariz., May, 1905; by Mr. J. L. Webb at Flagstaff, 
Williams, and Dead Mans Flat and near the Grand Canyon, Ariz., 
May to September, 1904, in the Lincoln National Forest at Cloudcroft, 
and in the Capitan Mountains, New Mexico, and in the Santa Cata- 
lina National Forest, Arizona, May to September, 1907, by Mr. W. F. 
Fiske at Meeks, Capitan, and Cloudcroft, N. Mex., and in the Davis 
Mountains, Texas, in 1907; by Mr. H. E. Burke at Panguitch Lake, 
Utah, in 1907; by Mr. W. D. Edmonston at Monte Vista, Colo., in 
1907. Additional localities through correspondence are Show Low, 
Chiricahua Mountains, Arizona; San Bernardino, Cal.; Fort Garland, 
Fig. 1-4. — The southwestern pine beetle: Distribution map. (Author's illustration. 1 ) 
Colo.; Escalante, L T tah, and Santa Fe, X. Mex. The species is repre- 
sented in the forest-insect collection of the Bureau of Entomology by 
more than 300 specimens of the insect and its work. 
This species is closely related to the western pine beetle, but is dis- 
tinguished by the slightly more slender form, coarser rugosities, aud 
distinct])' impressed striae of the elytra. It is easily distinguished 
from the other species occupying the same range by the denser rugosi- 
ties and absence of lonii" hairs on the elytra. 
BIBLIOGRAPHY. 
Hopkins, 1904 (under " The Arizona Dendroctonus"), pp. 42, -14; Hopkins, L909, 
pp. 85-87. 
