246 MISC. PUBLICATION 273. U.S. DEPT. OF AGRICULTURE 



LITERATURE CITED 



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(4) 



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(5) Banks, N., and Snyder, T. E. 



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(6) Barr. W. F., and Linsley, E. G. 



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(7) Baumhofer, L. G., and Graham, S. A. 



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(8) Beal, J. A. 



1934. RELATION OF AIR AND BARK TEMPERATURES OF INFESTED PON- 

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(9) 

 (10) 



(11) 



1937. the black hills beetle. U. S. Bur. Ent. and Plant Quar. 

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1934. RELATION BETWEEN TREE growth AND OUTBREAKS OF THE BLACK 



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 (12) Bedard, W. D. 



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 (13) 



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(14) Blackman, M. W. 



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(15) Brunner, J. 



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(16) 



1915. DOUGLAS FIR PITCH MOTH. U. S. Dept. Agr. Bui. 255, 23 pp., 



illus. 



(17) 



1915. THE ZIMMERMAN PINE MOTH. U. S. Dept. Agr. Bui. 295, 12 pp., 

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