19 



CASE 8. 



31. The Dark-Red Turpentine-Beetle (Dendroctonus valens Lee.) . 



The largest North American bark-beetle. Excavates very broad and long primary 

 galleries, the broods developing in broad side chambers in the bark of living, injured, 

 dying, and recently felled yellow pine, lodgepole pine, and doubtless most of the 

 other western pines. California to British Columbia and eastward to Kansas and 

 northern Michigan. A variety extends into the eastern United States. Common 

 and injurious, but not necessarily destructive to living timber. 



Exhibit: Adult and work. 



32. The Mountain Pine Dendroctonus (Dendroctonus n. sp.). 



A medium-sized black bark-beetle, excavating very long, winding galleries in the 

 bark of living, injured or declining, and recently felled mountain or silver pine and 

 sugar pine. Northern California to Washington eastward to Idaho and Montana. 

 Very common and capable of great destruction of the best timber. 



Exhibit: Adult and work. 



CASES 9 A1NTD lO. 



33. The Douglas Spruce Dendroctonus (Dendroctonus n. sp. ). (Dendroctonus 



similis in Division of Entomology, Bui. 21, n. s. '). 

 A large, reddish bark-beetle, excavating long longitudinal, slightly curved primary 

 galleries in the bark of living, injured, and recently felled Douglas spruce and west- 

 ern larch. New Mexico to British Columbia, Pacific coast and eastward through the 

 mountain regions. Very common and capable of destroying much valuable timber. 

 Exhibit: Adult and work. 



CASE lO. 



34. The "Western Pine Hylurgops (Hylurgops subcostulatus Mann.). 

 Excavates short, slightly curved, longitudinal galleries in the living bark of 



injured, dying, and recently felled sugar pine, western white pine, western yellow 

 pine, lodgepole pine, and probably other pines on the Pacific coast. Cascade and 

 Eocky Mountain region. Common. 

 Exhibit: Adult and work. 



35. The Sitka Spruce Hylurgops (Hylurgops rugipennis Mann.). 



Excavates a short, curved, longitudinal and subtransverse gallery from an entrance 

 in the living bark of injured, dying, and recently felled Sitka spruce and shore pine. 

 Coast region, California to Washington and Alaska. 



Exhibit: Adult and work. 



CASE 11. 



36. The Fir Wood-Engraver (Hylesinus n. sp.). 



Excavates a small central chamber at one side of the junction of two short trans- 

 verse, slightly curved egg galleries, which are deeply grooved in the surface of the 

 wood; the larvae also groove or engrave the surface of the wood in an ornamental 

 manner. Infests the grand fir and Douglas spruce. Port Williams and Port Angeles, 

 Wash. Common. 



Exhibit: Adult and work. 



37. The Larger Fir-Tree Bark-Beetle (Hylesinus granulatus Lee). 

 Excavates one or two transverse galleries from a central burrow in the bark and 



surface of wood near the base of dying grand fir. Port Williams, Wash.; also 

 recorded from California. 

 Exhibit: Adult and work. 



