THE GENUS DENDROCTONUS. 



137 



tinctly in front of the middle and the pronotal area is flat to apex. 

 The clypeus is short and l>n>ud, with an anterior dorsal gr<> >\e and 

 the apex broadly emarginate, lahium prominent, slightly longer than 

 the elypeus, with the apex broadly rounded. Larval types, labeled 

 "Hopk. U. S. Nos. 4081, 4046a, and 4049a." 



The most distinctive characters appear to be the anteriorly j lac:>d 

 transverse elevation of the front ; the characters of the mandibles and 

 anterior margin of the epicranium more nearly approach those found 

 D. engelmanni. 



latteries. The galleries of this species are of the same, or of 

 dlar character to those of D. piceaperda, as given in divisional, 





FIG. 84. Dendroctonus obesus: Distribution map. (Original.) 



subdivisional, or sectional characters, but differ in the more extended 

 common larval chamber which precedes the independent larval 

 mines which are usually so confused by crossing each other that they 

 are difficult to follow. 



Distribution (fig. 84). (Hopk. U. S.) Oregon: Newport. Wash- 

 ington: Hoquiam, Aberdeen. Additional localities from other col- 

 lections: (U.S.X.M.) (H. & S.) Vancouver, British Columbia; (Rev. 

 Keen) Queen Charlotte Islands, British Columbia. 



Host tree. Picea sitchensis. 



Identified specimens. Le Conte collection, 2 specimens : U.S.N.M., 

 1 from Doctor Fletcher; H. & S., 3; Hopk. U. S., more than 120 

 specimens, including all stages. 



