THE GENUS DENDROCTONUS. 



137 



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

 The clypeus is sliort and broad, with an anterior dorsal groove and 

 the apex broadly emarginate, labium prominent, slightly longer than 

 the clypeus, with the apex broadly rounded. Larval tjq^es, labeled 

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



The most distinctive characters appear to be the anteriorly j lacsd 

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

 anterior margin of the epicranium more nearly approach those found 

 in D. engelmanni. 



Galleries. — The galleries of this species are of the same, or of 

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



Fig. 8i.—Dendroctonusobesus: Distribution map. (Original.) 



sub divisional, 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. Wasli- 

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

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

 Keen) Queen Charlotte Islands, British Columbia. 



Host tree. — Picea sitcJiensis. 



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. 



