138 THE SCOLYTID BEETLES. 



species, although it was one of the first species of the genus to be 

 described from North America. 



BASIS OF INFORMATION. 



Information about this species is based on investigations by Mr. 

 W. F. Fiske, on Grand Island, Mich., October, 1906. An additional 

 locality from the collection of the United States National Museum 

 is Whitefish Point, Mich. The species is represented in the forest- 

 insect collection of the Bureau of Entomology by 14 specimens. 



BIBLIOGRAPHY. 



Hopkins, 1901a, p. 16; Hopkins, 19026, p. 10, footnote; Hopkins, 1909, pp. 138-140. 



No. 19. THE LODGEPOLE PINE BEETLE. 



(Dendroctonus murrayanx Hopk. Figs. 87, B, 89.) 



The lodgepole pine beetle is a stout, cylindrical barkbeetle, 5.4 to 6.5 

 mm. in length, with reddish elytra and dark-brown or black pro- 

 thorax; the head broad, convex; the pronotum slightly narrower 

 than the elytra, its sides narrowed and constricted toward the head, 

 the punctures coarser and less uneven sizes than in No. 18, and the 

 elytra with rows of coarse, shallow punctures. It attacks lodgepole 

 pine in southern Wyoming and occurs northward to Alberta, B. C. 

 The egg gallery is like that of the eastern spruce beetle, but the larval 

 mines are more like those of the European spruce beetle. Adults were 

 found excavating galleries and depositing eggs July 31, at Saratoga, 

 Wyo. (Medicine Bow National Forest), in young living lodgepole pine, 

 by Mr. Jeremiah Rebmann, of the Forest Service. On October 12 

 parent adults and half-grown larvae were found in the same tree. 



HABITS. 



According to Mr. Rebmann's observations, the species attacks 

 living trees toward the base, excavates galleries as much as 18 inches 

 in length, with large pitch tubes at the entrance, and deposits the eggs 

 along one side, partitioned off with boring dust. The same trees 

 were thickly infested with the Oregon Tomicus ; therefore it was not 

 determined whether the Dendroctonus or the Tomicus made the first 

 attack. The fact, however, that there were large pitch tubes indi- 

 cated that the primary attack was made by this species, although many 

 other trees were found infested and killed by the mountain pine 

 beetle. The work of the lodgepole pine beetle was observed in but 

 a few trees. 



Fragmentary specimens of a beetle identified as this species were 

 received in August, 1905, through the Forest Service, from Mr. 



