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- 



