The bacula which were borrowed from the University of Michigan,
Museum of Zoology, were processed according to the method
described by Friley (1947:395-397), whereas all others were
processed according to the method described by White (1951:125).
Thus the bacula that were borrowed from the University of
Michigan, are maintained there in a separate collection, whereas
the bacula borrowed from other museums and those that are at the
University of Kansas, Museum of Natural History, are housed with
the skulls of the corresponding specimens.
All measurements of the bacula were made by means of an eyepiece
micrometer.
A total of 194 bacula were seen. All of these are in the Museum
of Natural History of the University of Kansas, unless otherwise
indicated by the following symbols:
BS United States Biological Surveys Collection.
CN Chicago Natural History Museum.
LA Los Angeles County Museum.
MM University of Michigan, Museum of Zoology.
NM United States National Museum.
UU University of Utah, Museum of Zoology.
I am grateful to Professor E. Raymond Hall for guidance in my
study and thank Drs. Robert W. Wilson, Keith R. Kelson, and
Edwin C. Galbraith, as well as other friends and associates of
the Museum of Natural History, University of Kansas, for
encouragement and valuable suggestions. Dr. William L. Jellison,
United States Public Health Service, aided me in part of my
field work and kindly sent me some specimens of chipmunks. My
wife, Alice M. White, made the illustrations and helped me in
many ways.
For the loan of bacula I thank Dr. William H. Burt, University
of Michigan, Museum of Zoology. For permission to search for
bacula on study skins, and to process those that were found, I
thank Miss Viola S. Schantz, United States Fish and Wildlife
Service, Mr. Colin C. Sanborn, Chicago Natural History Museum,
Mr. Kenneth E. Stager, Los Angeles County Museum, Dr. David H.
Johnson, United States National Museum, and Dr. Stephen D.
Durrant, Museum of Zoology, University of Utah.
Assistance with field work is acknowledged from the Kansas
University Endowment Association, the National Science
Foundation and the United States Navy, Office of Naval Research,
through contract No. NR 161 791.