Jul. 48, Div. of Entomology, U. S. Dept. of Agriculture. 



Plate VII 



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Work of Dendroctonus frontalis and Dendroctonus terebrans. 



a. Dendroctonus frontalis: A. adult; B, pupa: C, larva: D, adult of B. valens; E. larva.— b. B. 

 frontalis: A. tibia; B. tarsus: C. B. B. antenna?: F, G, mouth parts. B. mints: II. Tibia: 

 /, tarsus: J. K. B. M, N, antenna?, all enlarged.— c. Pitch tube made by I), frontalis, natural 

 size.— (I. Healing wounds, from living pine tree, made by B. frontalis, reduced. — e. Pupa ea«es 

 of D. frontalis in outer pine bark.— /. B. frontalis: A, B. Longitudinal section of primary gal- 

 leries'; C, egg in egg cavity inside of gallery, the latter enlarged, others reduced.— g. Healing 

 wounds in living tree: E.'B. frontal is: F, B. valens.— h. Work of B. frontalis in pine bark is 

 shown at A. C. B. E. F. G: work of B. terebrans in pine bark at B. II. I: larva at work at II. 

 Both B. frontalis and B. terebrans attack spruce. (From Bui. 28, n. s„ Ihv. of Entomology, 

 U. S. Dept. of Agriculture.) 



