90 



THE SCOLYTID BEETLES. 



Wingate Military Reservation, Vermejo, Lincoln National Forest, 

 and Sierra Blanca Mountains. Utah: Escalante, La Salle National i 

 Forest, and Panguitch Lake. Additional locality from other collec- ( 

 tions: (B. & S.) Las Vegas, N. Mex. 



Host trees. Pinus ponder osa var. scopulorum (very common) | 

 and P. chihualiuana (rare). 



Identified specimens. Hopk. U. S., more than 100 specimens, j 

 including all stages and work; Horn, 1 specimen under D. approxi- 

 matus, labeled "N. M."; U.S.N.M., B. & S., 7 specimens, Las Vegas, | 

 N. Mex., 17-8, No. 164, and Williams, Ariz., 5-6, 5-7, and 5-10. 



BIBLIOGRAPHY. 



Dendroctonus approximatus Dietz, 1890, p. 31 (in part), New Mexico. Schwarz, ' 

 1902, p. 32 (in part) . 



FIG. 50. Dendroctonus convexifrons: Distribution map. (Original.) 



4. Dendroctonus frontalis Zimmerman. 



/! 



(PI. Ill, fig. 4.) 



Adult. Typical female: Length, 3.6 mm.; reddish-brown. Ely- 

 tral declivity with long hairs. Front with a moderately prominent 

 tubercle each side of a distinct median groove. Elytral striae dis- 

 tinctly punctured; interspacial rugosities moderately coarse, obtuse, 

 not very densely placed, and not very distinctly coarser toward the 

 base and vertex. Pronotum with a few long hairs on the anterior 

 section of the lateral area. Secondary sexual characters: Pronotum 

 with transverse ridge across the anterior area, the elytral declivity 

 shining and with finery granulate interspaces, the striae distinctly 

 impressed, but the punctures obscure. 



