102 



THE SCOLYTID BEETLES. 



striae very distinct, impressed, and distinctly puncturedj interspaces 

 sparsely tuberculate, and with a few fine punctures; lateral area 

 shining, with a few subacute tubercles, and rather coarse, distinct 

 punctures. 



Tj'pical female labeled, name label, ''Hopk. 1/16/08, 9 , individual 

 c, Barber & Schwarz, Coll[ectors], Flagstaff, Ar. 2.7" ( = July 2). 



Type of species, 9 , in Horn collection, A.E.S., Philadelphia, 

 labeled "Type D. approximatus n. sp., Col[orado]." 



Male type: Length, 5.7 mm. Head 

 with front convex, shining, a prominent 

 frontal tubercle each side of a deep 

 groove. Pronotum with broad impres- 

 sion across the anterior area; elytral de- 

 clivity same as female, except that the 

 interspaces are more densely rugose. 



Male type labeled, namelabel, "Hopk. 

 1/16/08, $ type of revision, type of 

 drawmg, Williams, Ar., 7.6" ( = June 7) 

 " S , Barber & Schwarz, Coll[ectors]." 



Variations. — The length varies from 4 

 to 7.4 mm., the average about 6 mm. 

 The color ranges from reddish-brown to 

 black. The epistomal, frontal, pronotal, 

 and elytral sculpture and vestiture vary 

 as usual. The greatest variation is in 

 the strial and interspacial punctures of 

 the declivity. 



Distinctive characters. — The characters 

 which distinguish this species from D. 

 parallelocollis, its nearest ally, are the 

 noticeably more shining and less pubes- 

 cent pronotum, with the punctures finer 

 and more shallow, the elytral striae con- 

 stantly more impressed, and the punc- 

 tures distinct. 



Revisional notes. — The original description (Dietz, 1890, p. 31), was 

 based on "four specimens, two males and two females, from New 

 Mexico and Colorado in Doctor Horn's collection." The specimen 

 labeled type in the Horn collection is a female from Colorado, and 

 agrees with the description, but one specimen labeled "N. M." is a 

 female of D. convexifrons Hopk., and one other specimen with the 

 type, but without locality label, is quite a different thing from either 

 of the other two. The specimen has not been examined since the 

 more distinctive characters of D. monticoix Hopk. and D. ponderosse 

 Hopk. have been recognized, but it evidently belongs to one of these 

 species. The fourth specimen mentioned by Dietz was not in the 



Fig. 63. — Dendroctonus approximatus: 

 Single egg gallery. (Original.) 



