71 



5. The Spruce Timber-Beetle. 

 Trypodendron biviUatus Kirby. 



Excavates several branching galleries from a single entrance burrow, the brood 

 developing in short side chambers in the sapwood of injured, dying, and recently 

 felled sjiruce, pine, hemlock, cedar, fir, and larch. Eastern, northeastern, and western 

 United States, Canada, and British Columbia to Alaska; very injurious. 



Exhibit: Adult and work. 



6. The Birch Timber-Beetle. 



Trypodendron n. sp. 



Excavates branching galleries from an entrance burrow and the broods develop in 

 short side chambers in sapwood and heartwood of paper birch. Kootenai, Idaho, 

 and northwestern Maine; also other V)irches in Maine. 



Exhibit: Adult and work. 



7. The Cosmopolitan Timber-Beetle. 



Xylchorns .■fa.rcseni Katz. 



Excavates branching galleries and broad brood chambers from an entrance burrow 

 in sapwood and heartwood of Douglas spruce in Oregon, red oak in Maine, apple and 

 hendock in West Virginia, and oak, beech, maple, lime tree, poplar, pine, spruce, 

 and fruit trees in Kurope. Widely distributed in different countries of the world, 

 especially in P^urope, North America, and Japan. 



Exhibit: Adult and work. 



INJURY BY BARK-BEETLES. ORDER COLEOPTERA, FAMILY 



SCOLYTIDiE. 



c^SK a. 



8. The Hairy Cryphalus. 



f'rypJialus n. sp. 



Excavates broad, irregular chambers in dying and dead bark of lowland fir. Port 

 AVilliams, Wash. 



Exhibit: Adult and work. 



9. The Western Oak Bark-Beetle. 

 PUyophthorns pHhlpennu Lee. 



Excavates two transverse galleries from a central entrance burrow in the bark of 

 injured, dying, and recently felled California black oak. Pacific post oak, and pos- 

 sibly other oaks. California to Oregon. 



Exhibit: Adult and work. 



10. The Densely-punctured Bark-Beetle. 



PityoplttJioriis coiifiHis Lee. 



Excavates a large central chamber and several radiating primary galleries, with 

 very deep egg cavities, in living bark of injured, dying, and recently felled western 

 yellow pine. Northern California, eastern Washington, and western Idaho. 



Exhibit: Adult and work. 



11. The Lodgepole Pine Bark -Beetle. 



Pilyo))]itIiori(s n. sp. 



Excavates radiating curved longitudinal galleries from a medium-sized central cham- 

 ber in living bark on large l)ranches of dying lodgepole pine. Eastern Washington. 

 Exhibit: Adult and work. 



12. The Knobcone Pine Bark-Beetle. 



PltynplithoruH n. sp. 



Excavates several radiating galleries from a large central chamber in living ))ark on 

 branches of injured and dying knol)cone pine and western yellow pine. Berkeley, 

 Cal., and Albany, Oreg. 



Exhibit: Work. 



