Sl 
78. The American Spruce Bark-Beetle. 
Dryocetes n. sp. 
Excavates short, irregular galleries in the living bark of injured, dying, and recently 
felled red, white, and black spruce in Maine, spruce and pine in West Virginia; 
also in spruce and pine in Europe. Widely distributed in Europe and eastern North 
America. 
Exuisit: Adult and work. 
79. The Birch Bark-Beetle. 
Dryocetes n. sp. 
Excavates irregular galleries in the bark of living, injured, and dying birch. 
Northwestern Maine and mountains of West Virginia. Common. Under favorable 
conditions causes the death of large trees. 
Exuisir: Adult and work. 
80. The Balsam Fir Bark-Beetle. 
Tomicus balsameus Lee. 
Excayates several radiating, curved, transverse galleries from a small central cham- 
ber in the living and dying bark of injured and dying balsam fir and red and black 
spruce. Western Maine; also recorded from northern Michigan and New York. 
Exuipir: Adult and work. 
81. The White Spruce Bark-Beetle. 
7 Tomicus n. sp. 
Excavates several long, radiating, longitudinal egg galleries from a large central 
chamber in the living bark of recently felled white spruce. Near Camp Caribou, 
northwestern Maine. 
Exuisir: Adult and work. 
82. The Hudson Bay Tomicus. 
Tomicus n. sp. 
Excavates one or two longitudinal primary galleries from a central burrow and 
small central chambers in the living bark of recently felled white and red spruce. 
Northwestern Maine; also recorded from Canada and British Columbia. 
Exuisir: Adult and work. 
CASH 21. 
83. The Spruce Bark-Beetle. 
Polygraphus rufipennis Kirby. 
Excavates three or four short, curved egg galleries from a large central chamber in 
the surface of the inner bark, through the bark and slightly grooving the surface of 
the wood of injured, declining, dying, and recently felled black, red, and white 
spruce, and rare in balsam fir. Very common throughout the northern and Appa- 
lachian spruce regions. 
Exursit: Adult and work. 
84. The Cedar Bark-Beetle. 
Phleosinus dentatus Lee. 
Excavates a single short longitudinal egg gallery from the entrance burrow and 
basal chambers in the bark and surface of wood of injured and dying red juniper 
and arborvite. Eastern and northwestern United States and Canada. Common. 
Exurpit: Adult and work. 
86. The Parmacheene Bark-Beetle. 
Xylochinus n. sp. 
Excavates short, irregular egg galleries in the dead bark of small red spruce and 
balsam fir. Islands of Parmacheene Lake, Maine. 
Exuipit: Work. 
25916—No. 53—05 ) 
