136 



THE SCOLYTID BEETLES. 



infested trees during June, July, and August would be less objection- 

 able. As a rule, however, winter operations would be preferable, the 

 work to be completed before the 1st of April. 



BASIS OF INFORMATION. 



Information regarding this species is based on investigations by the 

 writer at Newport, Oreg., April, 1899, and at Hoquiam, Wash., 

 May, 1903; by Mr. H. E. Burke at Aberdeen and Hoquiam, Wash., 

 April to June, 1903, and August, 1903, at Hoquiam and Aberdeen, 

 Wash., May to September, 1904, and at Hoquiam May and June, 

 1905. Additional localities from correspondence and other collec- 

 tions are Queen Charlotte Islands and Vancouver, B. C. It is rep- 

 resented in the forest-insect collection of the Bureau of Ento- 

 mology by more than 120 specimens. 



BIBLIOGRAPHY. 



Hopkins, 1899& (under Dendroctonus similis and sp. near D. rufipennis), pp. 15, 21; 

 Hopkins, 1902c, p. 22; Hopkins, 1903a, p. 60; Hopkins, 1904 (under D. obesus), p. 19; 

 Hopkins, 1909, pp. 135-138. 



No. 18. THE REDWINGED PINE BEETLE. 

 (Dendroctonus rufipennis Kirby. Figs. 87, A, 88.) 



The redwinged pine beetle (fig. 87, A) is a, stout, cylindrical bark- 

 beetle, with reddish elytra and dark-brown or black prothorax, 5 to 



Fig. 87.-4, The redwinged pine beetle (Dendroctonus rujipennis), adult, greatly enlarged; B, the 

 lodgepole pine beetle (Dendroctonus murrayanx), larva, less enlarged. (Author's illustrations.) 



