THE GENUS DENDROCTONUS. 105 



SUBDIVISION B. 

 (Species numbered 9 to 11, inclusive.) 



The distinctive characters common to the species of the second sub- 

 division are as follows: 



Adult. Body somewhat stout, prothorax with sides distinctly nar- 

 rowed and constricted toward the head; elytral declivity with second 

 stria distinctly curved, second interspace broader toward middle, nar- 

 rowed toward apex. 



Sexes. Female: Elytral declivity with interspaces smoother and 



>re shining, mandibles less stout. Male: The reverse. 



Pupa. Elytral pads roughened with granules, vertex of head 



jply grooved and with two prominent forward curved frontal spines 

 >ward the vertex; abdominal tergites 2 to 6 with long and prominent 



iural spines. 



Larva. Front with prominent transverse and rugose elevation, 



>re prominent toward the sutures. 



Galleries. Pupal cells in inner bark, eggs in approximate groups, 

 galleries slightly winding to straight, larval mines always exposed 

 in inner bark. 



9. Dendroctonus monticolse Hopkins. 



(PI. IV, fig. 9.) 



Adult. Type of species, female: Length 5.6 mm., light brown; 

 elytral declivity with a few long hairs; head with front convex, with- 

 out median elevation or groove, but with faint posterior impression; 

 elytral rugosities coarse, rather dense, coarser on dorsal area; striae 

 not distinctly impressed, except toward suture, punctures small. 

 Pronotum with the anterior area transversely impressed, but with 

 moderately long hairs on the lateral area, slightly longer on the ante- 

 rior section. Secondary sexual characters : Elytral declivity convex, 

 subopaque; striae distinct, and impressed, with fine obscure punc- 

 tures; interspaces with rather coarse granules, in approximate rows; 

 lateral area with obscure punctures and subacute rugosities. 



Type labeled "No 7447 U.S.N.M.," name label, "Hopk. 1/16/08, 

 Pinus monticola, Hopkins, collector, 5/27/99, Kootenai, Idaho, 9 , 

 Hopk. U. S. 205." 



Male type: Length 4.9 mm. Head with front less distinctly punc- 

 tured and more rugose than female: elytral declivity with striae more 

 distinctly punctured, interspaces more opaque, and rugosities slightly 

 coarser, the mandibles stouter than in female. 



Male type labeled same as female except sex label. 



Variations. The length varies from 3.7 to 6.4 mm., averaging about 

 5.5 mm. The color ranges from light brown to black; the sculpture 

 and vestiture of the epistoma, front, pronotum, and elytra vary as 

 usual, but the character of the strial punctures is fairly constant. 



