xii PREFACE. 
Descriptions of all species and races known to the Author, which 
were published prior to July 1, 1904, are given in this work. No 
attempt has been made to add to the List after that date, as the press 
work was then too far advanced to permit of any additions. 
In the Appendix at the end of Part II. will be found descriptions 
of all those Mammals that were published too late, as the pages 
passed through the press, to be included in their proper position in 
the volume. 
A work like the present could not be brought to a successful issue 
without material assistance from various quarters, as no Museum 
possesses collections of such extent as to render it independent of all 
others, and the Author is under many obligations to his colleagues 
in different Institutions for the loan of material and for all other aid 
requested toward the successful completion of his labors. It gives 
him, therefore, much pleasure to name the following to whom he 
feels much indebted: Dr. J. A. Allen, Curator of Vertebrate Zodlogy 
in the American Museum of Natural History, New York, and F. M. 
Chapman, Esq., Assistant Curator; Dr. C. H. Merriam, Chief of the Bio- 
logical Survey, Department of Agriculture, Washington, and his able 
assistants, Dr. A. K. Fisher, V. Bailey, W. H. Osgood, A. H. Howell, 
and E. A. Preble, Esqs.; R. Rathbun, Esq., Director of the National 
Museum, Washington; Dr. F. W. True, Curator of Biology in the 
National Museum, and G. S. Miller, Jr. Assistant Curator, and M. W. 
Lyon, Esq., of the Department of Mammals; Witmer Stone, Esq., 
Curator of Ornithology in the Academy of Natural Sciences of 
Philadelphia; Outram Bangs, Esq., of the Museum of Comparative 
Zoology, Cambridge, Mass.; Dr. E. A. Mearns, U.S. Army; and Old- 
field Thomas, Esq., of the British Museum. To all these the Author 
desires to express his thanks for having in many instances helped 
to make the ‘‘rough places smooth,”’ and the completion of this work 
in its present form a possibility. 
Dee 
T5th Fulv, 1904. 
