We gratefully acknowledge our debt to the Topeka Audubon Society for making this study possible by carefully collecting birds killed at the television tower. L. B. Carson deserves special mention for his general supervision of the bird collecting by the members of the Topeka Audubon Society. Members of the Society and others who picked up birds under the television tower were: Mrs. Lloyd Biggs, Elaine Carson, L. B. Carson, Jesse A. Eddy, Elizabeth Fisher, Mrs. Walter Huxman, Florence McKinney, Mrs. Charles Martin, Mrs. Fred P. Martin, T. W. Nelson, Fred Prebble, Grace Prebble, Orville Rice, Mrs. G. Warren Scholl, E. W. Senne, and Beatrice Swenson.

We received equally important assistance from students and staff of the University of Kansas in recording of data and preparation of specimens. The following helped in these ways: Rollin H. Baker, R. W. Dickerman, David L. Hardy, J. W. Hardy, Jane S. Mengel, Larry D. Mosby, Richard Van Gelder, South G. Van Hoose, and Glen E. Woolfenden. We are indebted to the Interlibrary Loan Service of the University of Kansas Library for help in securing certain reference works. Robert Sokal of the University of Kansas gave helpful advice concerning statistical procedures.