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Show Utah Academy of Sctenus, Arts and Letters 138 12. Severin, H. H. P. 1924. 13 .. [Vol. XIV, Causes of fluctuation of number of beet leafhoppers (Eutettix tenella Baker) in a natural breeding area of the San, Joaquin Valley in California. Jr. Econ. Ent. 17: 643. Essig, E. O. 1926. Insects of western North America. Macmillan Co., New York 180, 346, 350, 357, 565, 817, 818, 819, 879-880-p. 14. Henderson, C. F. 1928. Exploration in the Argentine .Republic for parasitism of the beet leafhopper, Euiettix ienellus Baker, Jr. Econ. Ent. 21: 863-871. 15. Knowlton, G. F. 1929. 16. Utah Agr, Knowlton, G. F. and Bowen, M. F. 1930. 17. Studies of the morphology of the beet leafhopper. Exp. Sta. Bul. 212: 11. Proc. Utah Acad. Notes on parasites of the beet leafhopper. Gir. and Apheli euteitixi 75. Sci. 7: Egg parasites, Polynemia sub no idea plutella Gir., reared in, northern Utah; Pipunculus a virescens Low.: dryinid. Knowlton, G. F. 1932. Utah Agr. Exp. Sta. The beet leafhopper in northern Utah. decoratus Geocoris Uhl., Nobis ferus L. and Bul. 234: 40-47.. Zelus socurs Uhl., bugs; Uta stansburiana stansburiana (B. and Sceloporus gracosus graciosus (B. and G.). Phrynosoma G.). platyrhinas Gir., P. douglassi ornatwm (Gir.), lizards; spiders. 18. Knowlton, G. F. 1932. 19. on Abstr. Dr. Gahan, A. B. 1932. 20. the beet leafhopper in northern Utah. Dissertations, Ohio State Univ. 8: 203-206. Studies Miscellaneous descriptions and notes on parasitic Hymenoptera. Ann. Ent. Soc. Amer. 25: 754-755. Gonatoceros capitatus Gah., an egg parasite from Utah. Knowton, G; F. and Janes, M. ]. Econ. Ent. 1933. .Lizards as predators of the beet leafhopper. Jour Sceloporus of including lizards, Six species 26: 1011-1016. and G.). skiltonianus Eumeces (B. Stej., elongatus 21. Knowlton, G. F. 1933. . Proc. Utah Acad. Sci. Notes on injurious Utah insects-1932. and a bug, Geocoris sp., A Agalliophagus stylopid, 10: 159-161. atricolor Montd. 22. Severin, H. H. P. 23. Knowlton, G. F. 1934. Beet leafhopper " 1933. .Field observations on the beet leafhopper, California. Hilgardia 7: 339-344. . In 238239 SCI. 11 : Proc. Utah tessellotw Cnemtdoph.erus in cages; Reut., Z elus SOC1US lizard'; Geocoris pollens Stal, elisus and L. hesperus), Aca. notes. N obis roseipennis tessellatus Say: a Uhl., and Lygeus pratensis (L.) bug predators. Eutetii» tenellus, (L. -. |