THE GENUS DENDROCTONUS. 



97 



Galleries. While the galleries of this species have not been defi- 

 nitely recognized from those of D. barberi, with which they are nearly 

 always present, it is evident that they are quite similar in general 

 character to those of D. barberi, especially in the concealed larval 

 mines. 



Distribution (fig. 58). (Hopk. U. S.) Arizona: Williams, Flag- 

 staff, Santa Catalina Mountains (rare). 



Host tree. Pinus ponderosa var. scopulorum. 



Identified specimens. Horn collection, 1 (?), B. & S., 2; Hopk. 

 U. S., more than 50 specimens, including adults, larvae, and pupae. 



BIBLIOGRAPHY. 

 Dendroctonus arizonicus Hopkins, 1902a, p. 3 (in part), manuscript name. 



FIG. 58. Dendroctonus arizonicus: Distribution map. (Original.) 

 6. Dendroctonus mexicanus Hopkins. 



(PL III, fig. 6.) 



Adult. Type of species, female: Length, 4 mm.; dark brown. 

 Slytra with long hairs on posterior half and declivity. Head with 

 ront convex, shining, with small frontal tubercles each side of the 

 hort, shallow groove; elytral striae distinctly impressed, but not dis- 

 inctly punctured; elytral rugosities distinctly coarser toward the 

 >ase and vertex, and with an evident row of acute rugosities on the 

 irst interspace. Pronotum clothed with short reclining hairs on 

 intire lateral area. Secondary sexual characters: Pronotum with 

 Tansverse ridge across the anterior area; elytral declivity shining, 

 striae distinct, obscurely punctured; interspaces roughened with 

 sparsely exposed granules, becoming coarser toward the vertex in 

 ateral area. 



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