86 THE SCOLYTID BEETLES. 



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

 collection. One specimen labeled "Williams, Ariz., 7.28, 151," and 

 one without label found in the Horn collection, both under D.frontalis, 

 and one specimen labeled "Ariz.," received from Doctor Dietz under 

 D. frontalis, all belong to D. barleri. These were evidently before 

 Doctor Dietz when he prepared his revision of D. frontalis, ibid. 



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

 characters, the apex of the front and middle femora is smooth; abdom- 

 inal tergites 3 to 6 with very small dorsal, lateral, and pleural spines; 

 land 2 without dorsal or lateral spines; 3 to 6 with minute dorsal and 

 lateral spines; 7 and 8 smooth, and 9 with small pleural spines. Pupal 

 type, labeled "Hopk. U. S. 5030" (in alcohol), differs from pupa of 

 D. Irevicomis in the absence of lateral spines on abdominal tergites 

 3 and 4; but these, with other pupal characters, are so variable that 



FIG. 47,-Dendroctonus barberi: Egg galleries. (Original.) 



not much reliance can be placed on any of them to separate closely 

 allied species. 



Larva. In addition to the generic, divisional, and subdivisional 

 characters, the clypeus has the apex broadly emarginate instead of 

 subacutely emarginate, as in D. Irevicomis. It also differs in the 

 more rounded apex of the labrum and in the more distinctly rugose 

 mandibles. Larval type labeled "Hopk. U. S. No. 5129 " (mounted 

 and alcoholic). 



Galleries (fig. 47). In addition to the divisional and subdivisional 

 characters, the egg galleries are usually distinctly transversely wind- 

 ing, thus differing from D. Irevicomis; otherwise there is little 

 difference. 



^ Distribution (fig. 48). (Hopk. U. S.) Arizona: Williams, Flagstaff, 

 San Francisco Mountains, Grand Canyon, Walnut Canyon, Dead Man's 



