81 



78. The American Spruce Bark-Beetle. 

 Drijococles n. sp. 



Excavates short, irregular galleries in the living bark of injured, dying, and recently 

 felled red, white, and black sjiruce in IMaine, spruce anfl pine in West Virginia; 

 also in spruce and pine in Europe. AVidely distributed in Europe and eastern North 

 America. 



Exhibit: Adult and work. 



79. The Birch Bark-Beetle. 



Dryocceles n. sp. 



Excavates irregular galleries in the bark of living, injured, and dying birch. 

 Northwestern Maine and mountains of West Virginia. Conunon. Under favorable 

 conditions causes the death of large trees. 



ExHiBrr: Adult and work. 



80. The Balsam Fir Bark-Beetle. 



Tomicus halsameus Lee. 



Excavates several radiating, curved, transverse galleries from a small central cham- 

 e living and dying bark of injured and dying balsam tir and red and black 

 Western Maine; also recorded from northern Michigan and New York. 



ber in tht 



spruce 



ExHiBrr: Adult and work. 



81. The White Spruce Bark-Beetle. 



Tomicus n. sp. 



Excavates several long, radiating, longitudinal egg galleries from a large central 

 chaniber in the living bark of recently felled white spruce. Near Camp Caribou, 

 northwestern Maine. 



Exhibit: Adult and work. 



82. The Hudson Bay Tomicus. 



Tomicus n. sp. 



Excavates one or two longitudinal primary galleries from a central l)urrow and 

 small central chambers in the living bark of recently felled white and red spruce. 

 Northwestern ]\laine; also recorded from Canada and British Columbia. 



Exhibit: Adult and work. 



CASE 31. 



83. The Spruce Bark-Beetle. 



Polygraphus rnfipennis Kirby. 



Excavates three or four short, curved egg galleries from a large central chamber in 

 the surface of the inner l)ark, 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. 



Exhibit: Adult and work. 



84. The Cedar Bark-Beetle. 

 Phlceosinus dentatus Lee. 



Excavates a single short longitudinal egg gallery from the entrance Inirrow and 

 basal chambers in the bark and surface of wood of injured and dying red juniper 

 and arborvitfe. Eastern and nortliwestern United States and Canada. C'ommon. 



Exhibit: Adult and work. 



86. The Parmacheene Bark-Beetle. 



X[//ochinut} n. sp. 



Excavates short, irregular egg galleries in the dead bark of small red spruce and 

 balsam fir. Islands of Parmacheene Lake, Maine. 

 Exhibit: Work. 



25916— No. 53—05 (i^ 



