I am greatly indebted to Dr. Lee R. Dice and Dr. W. H. Burt of the University of Michigan; and Dr. H. H. Lane of the University of Kansas, for advice and criticism during the preparation of this paper. Acknowledgment is also made of the courtesy extended by C. D. Bunker of the University of Kansas; C. W. Gilmore, Dr. C. Lewis Gazin, G. S. Miller, Jr., and Dr. Remington Kellogg of the United States National Museum; A. H. Howell, and Dr. H. H. T. Jackson of the United States Biological Survey; E. Furlong of the California Institute of Technology; Dr. R. A. Stirton of the University of California; and Colin C. Sanborn of Field Museum of Natural History for permitting the study of the collections under their care or for the loan of comparative material and for advice. The drawings, unless otherwise credited, were made by Miss Frances Watson.
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Claude W. Hibbard (1941) studied this question.
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