446 WEST VIRGINIA EXPERIMENT* STATION 



170. Tomicus caelatus Eichh. Very common in partly living 

 bark on living, dying and dead standing and felled trees. In- 

 fests all of the pines and the native and introduced spruces. 

 Widely distributed. 



171. Pityogenes sparsus Lee. Very common in partly living 



Fig. XC Galleries of Tomicus pini in white pine: a, surface of 

 wood : b, inner bark, 



Fig. XCI Galleries of Tomicus avulsus in bark of large 

 scrub pine, which had recently died. 



