25 



76. The White Pine Wood-Engraver (Pityogenesn. sp.). 



Excavates numerous short, radiating, curved egg galleries from a large central 

 chamber in the bark and surface of wood of large and small branches and small, 

 dying white pine. Northern Maine to West Virginia. Common. Heretofore rec- 

 ognized as Pityophthorus sparsus Lee. 



Exhibit: Adult and work. 



CASE SO. 



77. The Small Red Spruce Bark-Beetle (Dryoccetes n. sp.). 



Excavates three or four short, curved galleries from a small central cavity in the 

 bark and surface of the wood of injured, dying, and recently felled red, white, and 

 black spruce, Maine to northern New York, and the red spruce in the mountains of 

 West Virginia. Common. 



Exhibit: Adult and work. 



78. The American Spruce Bark-Beetle (Dryoccetes 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. 



Exhibit: Adult and work. 



79. The Birch Bark-Beetle (Dryoccetes n. sp.). 



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

 western Maine and mountains of West Virginia. Common. Under favorable condi- 

 tions causes the death of large trees. 



Exhibit: Adult and work. 



80. The Balsam Fir Bark-Beetle (Tomicus balsameus Lee). 



Excavates 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. 



Exhibit: Adult and work. 



81. The White Spruce Bark-Beetle (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. 



Exhibit: 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. 



Exhibit: Adult and work. 



CASE 31. 



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. 



Exhibit: Adult and work. 



84. The Cedar Bark-Beetle (Phlceosinus 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 junij^er and 

 eastern arborvitse. Eastern and northwestern United States and Canada. Common. 



Exhibit: Adult and work. 



