I gratefully acknowledge the generous help of Professor A. Byron Leonard, under whose guidance this study was conducted and thank Professor E. Raymond Hall, Professor Howard A. Matzke, and Dr. Irwin Baird for numerous helpful suggestions and criticisms.

For help in collecting specimens I thank J. R. Alcorn, W. C. Glazener (through the courtesy of the Texas Game and Fish Commission), Dr. Harrison B. Tordoff, Jerry Tash, William Brecheisen, and Louis Brecheisen. I thank also Edwin Gebhard of the Kansas Forestry, Fish and Game Commission for help in locating the Lesser Prairie Chickens.

I am grateful for the assistance of Mrs. Chester Alexander and Dr. L. C. Dahl in translating a Russian and a Dutch reference, and thank George Young and James Bee for making equipment used in my study.

All of the original drawings except Fig. 1 were made by me, although the final inking of Figs. 12 through 19 was done by Bret Waller. Fig. 1 was drawn by Kay Swearingen.

I was aided in this study during the summer of 1960 by a research grant from the University of Kansas.