INSECT ENEMIES OF WESTERN FORESTS 199 
(37) GRAHAM, S. A. 
1922. SOME ENTOMOLOGICAL ASPECTS OF THE SLASH DISPOSAL PROBLEM. 
Jour. Forestry 20: 437-447. 
and BAUMHOFER, L. G. 
1927. THE PINE TIP MOTH IN THE NEBRASKA NATIONAL FOREST. Jour. 
Agr. Research 35: 323-833, illus. 
(39) HetrnricyH, C. 
1923. REVISION OF THE NORTH AMERICAN MOTHS OF THE SUBFAMILY 
EUCOSMINAE OF THE FAMILY OLETHREUTIDAE. U. S. Natl. Mus. 
Bull. 123, 298 pp., illus. 
(40) Hersert, F. B. 
1920. WESTERN TWIG PRUNERS. Jour: Eeon. Ent. 138: 360-3638. 
(38) 
1920. CYPRESS BARK SCALE. U. 8S. Dept. Agr. Bull. 888, 22 pp., illus. 
1924. THE EUROPEAN ELM SCALE IN THE WEST. U.S. Dept. Agr. Bull. 1223, 
20 pp., illus. 
(43) Horer, G. 
1920. THE ASPEN BORER AND HOW TO CONTROL IT. U.S. Dept. Agr. Farm- 
ers’ Bull. 1154, 11 pp., illus. 
(44) Hopxins, A. D. 
1903. INSECT ENEMIES! OF THE REDWOOD. U. S. Dept. Agr., Bur. Forestry 
Bull. 88: 32-40, illus. 
(45) 
1906. THE LOCUST BORER. (CYLLENE) ROBINL#® FORST.) U. S. Dept. Agr., 
Bur. Ent. Bull. 58: 1-16, illus. 
(46) 
1909. PRACTICAL INFORMATION ON THE SCOLYTID BEETLES OF NORTH AMERICAN 
FORESTS. I. BARK BEETLES OF THE GENUS DENDROCTONUS. U. S. 
Dept. Agr., Bur. Ent. Bull. 83, pt. 1, 169 pp., illus. 
(47) 
1910. INSECT INJURIES TO FOREST PRODUCTS. U. S. Dept. Agr., Bur. Ent. 
Cire. 128, 9 pp. 
(48) 
1911. CONTRIBUTIONS TOWARDS A MONOGRAPH OF THE BARK-WEEVILS OF THE 
GENUS PISSODES. U. S. Dept. Agr., Bur. Ent. Bull. (tech. ser.) 
20: 1-68, illus. 
(49) and Snyper, T. EH. 
1917. POWDER-POST DAMAGE BY LYCTUS BEETLES TO SEASONED HARDWOODS. 
U. S. Dept. Agr. Farmers’ Bull. 778, 20 pp., illus. 
(49a) Hoprine, G. R. 
1928. THE WESTERN CEDAR BORER (TRACHYKELE BLONDELI MARS.) Can. 
Dept. Agr. Pamphlet 94 (n. s.) 17 pp., illus. 
(49b) 
1934. AN ACCOUNT OF THE WESTERN HEMLOCK LOOPER (ELLOPIA SOMNIARIA 
HULST.) ON CONIFERS IN BRITISH COLUMBIA. Sci. Agr. 15 (1): 
12-29, illus. 
(49c) and JENKINS, J. H. 
1933. THE EFFECT OF KILN TEMPERATURES AND AIR-SEASONING ON AMBROSIA 
INSECTS (PINWORMS). Can. Dept. Int. Forest Ser. Cire. 38, 14 
pp., illus. 
(50) Hopprne, R. 
1921. THH CONTROL OF BARK-BEETLE OUTBREAKS IN BRITISH COLUMBIA. 
Canada Dept. Agr., Ent. Branch Cire. 15, 15 pp., illus. 
(51) Howarp, L. O. 
1917. THE PRACTICAL USE OF THE INSECT ENEMIES OF INJURIOUS INSECTS. 
U. S. Dept. Agr. Yearbook 1916: 273-288, illus. 
(52) Hupparp, H. G. 
1897. THE AMBROSIA BEETLES OF THE! UNITED STATES. U. S. Dept. Agr., 
Div. Ent. Bull. (n. s.) 7: 1-80, illus. 
(58) Hystop, J. A. 
1915. WIREWORMS ATTACKING CEREAL AND FORAGE CROPS. U. S. Dept. Agr. 
Bull. 156, 34 pp. illus. 
(58a) KEEN, F. P. 
1931. PINE BEETLE CONTROL COSTS REDUCED THROUGH LOGGING AND SALVAGE. 
U. S. Dept. Agr. Yearbook 1931, pp. 428-430, illus. 
