110 THE SCOLYTID BEETLES. 



much finer on the lateral area and coarser toward and on the -vertex. 

 Pronotum with moderately long, erect hairs on the lateral area, con- 

 siderably longer toward the anterior section; punctures of elytral 

 striae distinct and coarse. Secondary sexual characters same as in 

 preceding species. 



Type labeled "Type No. 7448 U.S.N.M.," name label, "Hopk. 

 1/16/08, Pinus ponderosa, Spearfish, S. D., 7/1/00, A. D. Hopkins, 

 collector, 9 , Hopk. U. S. 434." 



Male type: Length 5.5 mm. Characters same as in female, except 

 pronotum with very dense, subrugose punctures toward the anterior; 

 margin, the elytral rugosities finer and less dense; elytral declivity | 

 with coarser interspacial granules, and the strial punctures slightly | 

 more distinct. 



Male type labeled same as female, except sex label. 



Variations. The length varies from 4.5 to 7 mm., with the average 

 about 6 mm. The color ranges from brown (in young specimens) to 

 black in matured. The sculpture and vestiture of the epistoma, front, 

 pronotum, and elytra vary as usual, and there is a quite noticeable 

 variation from a somewhat slender form to a shorter and stouter one. 

 The greatest variation is in length and in the size and density of the 

 punctures of the pronotum and of the striae of the elytra. 



Distinctive characters. The characters which distinguish this species 

 from the one following are its average smaller size, less shining pro- 

 notum, with coarser and deeper punctures, and from the preceding 

 by its average larger size and somewhat stouter form, with the elytral 

 striae more distinctly impressed and the punctures distinctly coarser. 

 There is a considerable range of variation in these characters, but the 

 specimens with less distinctly impressed striae and finer punctures 

 which might be mistaken for D. monticola are exceptional, and should 

 cause no confusion as long as the range of distribution of the two 

 species is so distinct. 



Revisional notes. In March, 1902, the writer (Hopkins, 1902a, 

 p. 3) published the manuscript name, D. ponder osse, without descrip- 

 tion of any kind, and in April of the same year (Hopkins, 1902b, p. 10) 

 he gave a brief description under D. ponderosa, but, as indicated by 

 the manuscript name, it was intended that the name should relate to 

 the host tree, Pinus ponderosa, therefore the name D. ponderosse, under 

 which it is here fully described, should stand. The species is repre- 

 sented in the Le Conte collection by one immature example, which, 

 in 1900, was in the D. rufipennis series, labeled "Specimen 8, Col." 

 In March, 1907, this specimen was again examined by the writer, and 

 identified as D. ponderosse. It is evident that it was in Le Conte's 

 collection when he prepared his latest revision (1876), but there is 





