PLATE XII. 



Wofk af Dendroctonun fn>ntalis and Dendroctomis terehrani^. 

 (From drawings illustrating Bulletin ">(), W. Va. Asrr. Exp. Station.) 



a. Dendroctomis frontalis : ,4, ail tilt: /?, pupa; C, larva; D, adult of Dendrocto- 



nus ierebrans; E, larva. 

 Z), Dendroctonus frontalis: A, tibia: B, tarsus; C, D, E, antennfe; F. G. mouth 



parts. Dendroctonns tcrehrans: H. tibia; 7. tarsus; J, K, L, 3/, A', antenna — 



all enlarged. 



c. Pitch tube made by De ndroctonns frontalis — natural size. 



d. Healing vcounds, from living pine tree, made by D. frontalis — reduced. 



e. Pupa cases of D. frontalis in outer pine bark. 



/, Dendructonns frontalis: A. B, longitudinal section of primary galleries; C, 

 egg in egg cavity inside of gallery — the latter enlarged: others reduced. 



g, Healing wounds in living tree: E. Dendrocfo)nfs frontalis; F, Dendroctonus 

 terehrans. 



Ji, Work of Dendroctomis frontalis in pine bark is shown at A. C, D, E, F, G; 

 work of 7^. terehrans in pine bark at B, II. I: larva at woi-k at H. 



Note. — Both T>. frontalis and I>. ferelirans attack si)ruce. 



