56 
THE SCOLYTID BEETLES. 
BASIS OF INFORMATION. 
The preceding information relating to this barkbeetle is based on 
investigations by the writer at Williams, Ariz., September, 1902, at 
Vermejo, N. Mex., May, 1903, at Flagstaff, Ariz., May, 1904, and 
near Ft. Garland, Colo., June, 1906; by Mr. J. L.Webb at Flagstaff, 
Ariz., May to September, 1904, at Cloudcroft, N. Mex., and in the 
Santa Catalina National Forest, Arizona, May to September, 1907; 
by Mr. W. F. Fiske, at Meeks, Cloudcroft, and Capitan, N. Mex., in 
1907; by Mr. H. E. Burke, at Panguitch, Utah, in 1907; by Mr. 
W. D. Edmonston, at Monte Vista and Laveta,, Colo., and La Sal, 
Utah, in 1907. Additional localities through correspondence are 
Las Animas County, Colo.; Show Low, and Paradise, Ariz., and 
Fig. 17.— The roundheaded pine beetle: Distribution map. (Author's illustration. 
the Fort Wingate Military Reservation, New Mexico. The species 
is represented in the forest-insect collection of the Bureau of Ento- 
mology by more than 100 specimens of the insect and of its work. 
BIBLIOGRAPHY. 
Hopkins, 1909, pp. 87-90. 
No. 4. THE SOUTHERN PINE BEETLE. 
(Dendroctonus frontalis Zimm. Figs. 18-31.) 
The southern pine beetle is a slender, cylindrical, brownish to black 
beetle, 2.2 to 4.2 mm. in length; the head is broad, with median ele- 
vations each side of a distinct frontal groove; the pro thorax is punc- 
