xii PREFACE. 



Descriptions of all species and races known to the Author, which 

 were published prior to July i, 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 Zoology 

 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. 



D. G. E. 



i$th July, 1904. 



