INSECT ENEMIES OF WESTERN FORESTS 249 



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1941. WESTERN HEMLOCK SAWFLY, NEODIPRION TSUGAE MIDDLETON, 



and its parasites in Oregon. Jour. Econ. Ent. 34: 46-52. 



(57) Gambrell, F. L. 



1938. THE strawberry weevil as a pest of conifers in nursery 

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(58) Garman, H. 



1915. THE LOCUST BORER (CYLLENE ROBINIAE) AND OTHER INSECT 



enemies of the black locust. Ky. State Forester Bien. 

 Rpt. 2: [32J-63, illus. 



(59) Gillette, C. P., and Langford, G. S. 



1925. CONTROL OF SOME SCALE INSECTS INFESTING COLORADO TREES 



and shrubs. Colo. State Ent. Cir. 46, 14 pp., illus. 



(60) Graham, S. A. 



1922. THE RED TURPENTINE BEETLE IN ITASCA PARK. Minn. State Ent. 



Rpt. 19: 15-21. 



1922. SOME ENTOMOLOGICAL ASPECTS OF THE SLASH DISPOSAL PROBLEM. 



Jour. Forestry 20: 437-447. 



(61) 



(62) 



1939. PRINCIPLES OF FOREST ENTOMOLOGY. Ed. 2. 410 pp., illus. 



(63) and Baumhofer, L. G. 



1927. THE PINE TIP MOTH IN THE NEBRASKA NATIONAL FOREST. Jour. 



Agr. Res. 35: 323-333, illus. 

 (64) and Orr, L, W. 



1940. THE SPRUCE BUDWORM IN MINNESOTA. Minn. Agr. Expt. Sta. 



Tech. Bui. 142, 27 pp., illus. 



(65) Harvey, P. A. 



1942. the common dry-wood termite. Calif. Univ. Agr. Expt. Sta. 

 Unnumbered Pub., 4 pp. 



(66) Heinrich, C. 



1923. revision of the north American moths of the subfamily 

 eucosminae of the family olethreutidae. U. S. Natl. 

 Mus. Bui. 123, 298 pp., illus. 



(67) Herbert, F. B. 



1920. western twig pruners. Jour. Econ. Ent. 13: 360-363. 



(68) 



1920. cypress bark scale. U. S. Dept. Agr. Bui. 838, 22 pp., illus. 



(69) Hofer, G. 



1920. the aspen borer and how to control it. U. S. Dept. Agr. 

 Farmers' Bui. 1154, 11 pp., illus. 



(70) Hopkins, A. D. 



1903. insect enemies of the redwood. U. S. Dept. Agr., Bur. 

 Forestry Bui. 38: 32-40, illus. 

 (71) 



1906. THE LOCUST BORER (CYLLENE ROBINIAE FORST) . U. S. Dept. Agr. 



Bur. Ent. Bui. 58: 1-16, illus. 

 (72) 



1909. PRACTICAL INFORMATION ON THE SCOLYTID BEETLES OF NORTH 



AMERICA FORESTS. I. BARK BEETLES OF THE GENUS DENDROC- 



tonus. U. S. Dept. Agr. Bur. Ent. Bui. 83, part 1, 169 pp., 

 illus. 

 (73) 



1910. INSECT INJURIES TO FOREST PRODUCTS. U. S. Bur. Ent. Cir. 128, 



9 pp. 

 (74) 



1911. CONTRIBUTIONS TOWARDS A MONOGRAPH OF THE BARK-WEEVILS 



OF the genus pissodes. U. S. Bur. Ent. Bui. (tech. ser.) 

 20: 1-68, illus. 

 (75) and Snyder, T. E. 



1917. POWDER-POST DAMAGE BY LYCTUS BEETLES TO SEASONED HARD- 

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