96 



THE SCOLYTID BEETLES. 



Type labeled "Type No. 7446, U.S.N.M.," name label, "Hopk. 

 1/15/05, 9 , Barber & Schwarz Collectors], Williams, Ar., 7.6 

 (-June 7). 



Male type: Length, 3.3 mm. Front with prominent tubercles each 

 side of a deep median groove. Pronotum with transverse impression 

 and faint transverse elevation across anterior area. Elytral declivity 

 less shining; striae more distinctly impressed and punctured and the 

 interspaces more convex and distinctly rugose than in the female. 



Male type labeled, name label, "Hopk. Jan. l5/Q8,Pinusponderosa, 

 Webb, Collr., 8-22-04, Flagstaff, Ariz., $ , Hopk.U. S. No. 5118." 



Variations. Length 3.5 to 3.9 mm., average about 3.6 mm.; color 

 from light brown to black. The short hairs of the lateral area 

 of the elytra range from obscure to distinct, and the long hairs of 

 the elytral declivity range from short and sparse to very long and 

 numerous. The variation in the size of the punctures of the pronotum 

 is less marked than in other species. 



Distinctive characters. The coarse punctures of the pronotum, and 

 especially the very coarse shallow rugose ones, together with the 

 coarser rugosities of the elytra, serve to distinguish specimens of 

 this species from D. barberi, and the absence of short reclining hairs 

 on the pronotum with the more distinctly impressed elytral striae 

 and less evident short and long hairs on the elytra serve to distinguish 

 it from D. mexicanus, which is its nearest ally. It is also distinguished 

 from D.frontalis by its larger size, coarser punctures of the pronotum, 

 and coarser rugosities of the elytra, as it is from small examples of D. 

 convexifrons by the grooved front, and from small examples of D. 

 approximatus by the impressed elytral striae and the shorter, more 

 yellow, and less numerous hairs of the declivity. 



Revisional notes. This species is not represented in the Le Conte 

 collection and not in the Horn collection unless it is one specimen 

 found under D.frontalis labeled "Williams, Ariz., 7.28, 152," which 

 the writer has not seen since D. arizonicus has been recognized as a 

 distinct species. If this specimen is D. arizonicus, it was evidently 

 before Doctor Dietz when he prepared his revised description of D. 

 frontalis. 



Pupa. In addition to the generic and divisional characters, the 

 apices of the front and middle femora have each a small spine. Ab- 

 dominal tergites 2 to 6 with small pleural spines and 4 to 6 with small 

 dorsal, lateral, and pleural spines, increasing in size toward 6; 7 and 

 8 with a pair of dorsal granules, coarser on 7. Pupal type labeled 

 "Hopk. U.S. No. 3129." 



Larva. In addition to the divisional characters, the front has a 

 median transverse and rugose convexity produced toward apex; cly- 

 peus with apex broadly emarginate; labrum broad, with apex broadly 

 rounded. Thoracic segments with foot calli on sternellar lobes. 

 Larval type labeled "Hopk. U. S. No. 5156." 



