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Show Knowlton: 1937] Control of the Beet Leafhopper in Utah 139 24. Knowlton, G. F. and Smith, C. F. 1935. Beet leafhopper predators-birds. Proc. Utah Acad. Sci. 12: 249-253. Seventeen species of birds contained 1848 E. tenellus. 25. Knowlton, G. F. 1935. Beet leafhopper insect predator studies. Proc. Utah Acad. Sci. 12: 255-260. Nysius ericae, (Sch.), bug; Hippodamia quinque signata Kirby, H. convergens Guer., lady bird beetles; Chrysopa sp. 26. Knowlton, G. F. 1936. 27. Valley lizards. Copeia, May 10: 64-65. Knowlton, G. F. 1936. 28. Food habits of Skull Utah Acad. Sci. 13: 245-247. 276. Pipunculidae. Pipun culus, 37 dryinid, and 3 Stylopid larvae parasitizing 17,003 E. tenellus dissected from Tooele County localities, 1929-1934. Proc. Knowlton, G. F. 1936. The insect fauna of Utah from the standpoint of an economic entomologist. Proc. Utah Acad. Sci. 13: 250-253. N abis alter nata Parsh. 29. Knowlton, G. F. 1936. 30. 31. Lizard digestion studies. Herpitologica Sweetman, H. L. 1936. The biological control of insects. N. Y. p. 113, 331. 1: 9-10. Comstock Pub. Co., Ithaca, Knowlton, G. F. 1937. Utah birds in the control of certain insect pests. Acad. Sci. 14. Proc. Utah |