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5. The Spruce Timber-Beetle. 
Trypodendron bivittatus 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 spruce, pine, hemlock, cedar, fir,and larch. Eastern, northeastern, and western 
United States, Canada, and British Columbia to Alaska; very injurfous: 
Exuisir: 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 birches in Maine. 
Exuipir: Adult and work. 
7. The Cosmopolitan Timber-Beetle. 
Xyleborus saxeseni Ratz. 
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 
hemlock 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 Europe, North America, and Japan. 
Exarsit: Adult and work. 
INJURY BY BARK-BEETLES. ORDER COLEOPTERA, FAMILY 
SCOLYTIDZ. 
CASH 2. 
8. The Hairy Cryphalus. 
| Cryphalus n. sp. 
Excavates broad, irregular chambers in dying and dead bark of lowland fir. Port 
Williams, Wash. 
Exaursir: Adult and work. 
9. The Western Oak Bark-Beetle. 
Pityophthorus pubipennis 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. 
Exursir: Adult and work. 
10. The Densely-punctured Bark-Beetle. 
Pityophthorus confinis 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. 
Exaipit: Adult and work. 
11. The Lodgepole Pine Bark-Beetle. 
Pityophthorus n. sp. 
Excavates radiating curved longitudinal galleries from a medium-sized central cham- 
ber in living bark on large branches of dying lodgepole pine. Eastern Washington. 
Exuisrr: Adult and work. 
12. The Knobcone Pine Bark-Beetle. 
Pityophthorus n. sp. 
Excavates several radiating galleries from a large central chamber in living bark on 
branches of injured and dying knobcone pine and western yellow pine. Berkeley, 
Cal., and Albany, Oreg. 
Exuisit: Work. 
