THE PINE INVESTIGATION. 



447 



and dead bark on branches and small twigs of standing and 

 felled trees. Infests the white pine. 



172. Pityogenes 

 playiatus Lee. Very 

 common in partly 

 living and dead bark jfp;ii;;;-'.>|| 

 on small injured or 

 dying trees, and 



branches Of large Fig . xciI-Species of the genus Pityogene,. 



trees, Infests the scrub and yellow pine. 



173. Polygraphus rufipennis 

 Kirby. The destructive spruce 

 bark beetle. A very common 

 species wherever the black 

 spruce grows in West Virginia, 

 but only a single example has 

 been found in pine. Appears 

 to be confined in its distribu- 

 tion to the Canadian Life Zone. 

 It has not been found in culti- 

 vated spruce in the Upper 

 Austral Life Zone. 



174. Dendroetonus terebrans 

 Oliv, Very common 1890, -94, 

 attacking all of the pines and 

 Norway spruce near the base 

 of living and dying trees and 

 stumps. Widely distributed. 



175. Dendroetonus sp. near 

 Dendroetonus ruftpennis Lee 

 A single specimen found ex- 

 cavating gallery and deposit- 

 ing eggs in living bark of black 

 spruce stump, near Horton, 

 May 21, '93. 



176, Dendrootonuq $imple% J^ec. n Adult founcj w bark of 



Fig. XCIII Galleries of Pityo- 

 genes sparsus, in white pine twigs. 



