80 



70. The Minute Oak Bark-Beetle. 



Pityophthorus ininntissiinus Ziniiii. 



Excavates two straight transverse galleries from a central entrance burrow and 

 elongate longitudinal chamber in the bark and surface of wood of branches on living, 

 dying, and felled trees, rarely in the thicker bark on the main trunk, of red oak, 

 southern Maine, and other oaks in the eastern United States. 



Exhibit: Adult and work. 



71. The Minute Birch Bark-Beetle. 



Pityophthorui^ n. sp. 



P'xcavates galleries like that of the minute oak bark-beetle (70) in the living and 

 dying l)ark of l^ranches of the paper I^irch. ycnithern Massachusetts. 

 Exhibit: Adult and work. 



72. The White Pine Twig-Beetle. 

 Pllyophthoras n. s]). 



Excavates several long winding galleries from a central chamber in tlie bark; 

 deeply giooved in the surface of the wood of small dying and broken branches of 

 white pine, famj) Caribou, Maine. 



Exhibit: Adult and work. 



73. The Minute Spruce-Twig- Wood-Engraver. 



Plfi/ojiJifliorii!^ n. sp. 



Excavates a large central chamber and several curved galleries in the bark and 

 deeply grooved in the surface of the wood of small branches of felled red spruce. 

 Shores of Barkers Lake, Maine, and West Virginia. 

 Exhibit: Work. 



74. The Spruce "Wood-Engraver. 

 Pityophthorus carinicep>i Lee. 



Excavates many short, radiating, curved gallei'ies from a large central chamber in 

 the l)ark and surface of the wood of twigs and branches of dying trees and main stem 

 of voung dying red spruce. Western Maine to Morgantown, W. Xa., and Detroit, 

 Mich. 



Exhibit: Adult and work. 



75. The Black Spruce Wood-Engraver. 



Pltyophtliorna n. sji. 



Excavates short longitudinal galleries from the entrance burrow in the bark and 

 surface of wood of small dying black spruce. Shores of Parmacheene Lake, north- 

 western Maine; Peakes Island, in Casco Bay, Maine, and Adirondacks, New York. 



Exhibit: Adult'and work. 



76. The White Pine Wood-Engraver. 



Pityoyenes n. sp. 



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

 chamlier in the l)ark 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. 



77. The Small Bed Spruce Bark-Beetle. 



Dr]ioc(rte>t n. sp. 



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

 bark and surfac-e of the wood of injured, dying, and recently felled red, white, and 

 black spruce, .Maine to northern New York, and the red s[)ruce in the mountains of 

 West Virginia. Common. 



Exhibit: Adult and work. 



