The investigation here reported on was supported jointly by the Kansas Forestry, Fish and Game Commission and the State Biological Survey of Kansas.

I thank Messrs. W. L. Minckley, D. A. Distler, J. McMullen, A. L. Metcalf, L. J. Olund, M. Topping, B. Nelson and Claude Hastings for assistance in the field, and Mr. Ernest Craig, Game Protector, Erie, Kansas, for valuable suggestions and co-operation. I am especially grateful to Associate Professor Frank B. Cross for his pre-drought data, guidance, and criticism throughout the course of the work. I thank the many landowners who allowed me access to streams, and am especially indebted to Mr. and Mrs. Floyd Meats and Mr. and Mrs. Oliver Craig for their hospitality and assistance.

Assistant Professor Kenneth B. Armitage and Associate Professor Ronald L. McGregor read the manuscript and gave helpful advice. Mrs. Maxine Deacon typed the manuscript and assisted in other ways.