The Mammals of Colorado 
Most of the descriptions of the species have been made 
from Colorado specimens in my collection; a number of 
others were taken from specimens kindly loaned for the 
purpose by Dr. C. Hart Merriam, Chief of the Biological 
Survey of the U. S. Department of Agriculture. I am also 
indebted to him for aid in many points, such as identifying 
specimens and answering innumerable questions regarding 
matters which came up from time to time. Messrs. E. W. 
Nelson, Vernon Bailey, and W. H. Osgood of the Biological 
Survey have also been kind in answering queries put to them 
in their departments. Messrs. W. C. Ferrill and H. G. 
Smith, Curator and Assistant Curator respectively, of the 
State Historical and Natural History Society at Denver, 
have allowed me to examine and describe specimens in their 
charge. V. H. Borcherdt, Chief Taxidermist, and L. J. 
Hersey, of the Department of Ornithology, of the Colorado 
Museum of Natural History, Denver, have allowed me access 
to specimens and notes in their care, belonging to the " Carter 
Collection," which were especially useful in giving Colorado 
data not otherwise attainable. Many other friends have 
also aided in various ways. Some of the descriptions have 
been taken from various books, credit for them, usually at 
least, being given in the individual cases. 
Robert B. Rockwell and Herman W. Nash have generously 
permitted the use of photographs taken by them of certain 
species, which are duly credited in the proper places. I 
also wish to acknowledge the permission kindly given by 
Mr. Junius Henderson, Curator of the Museum of the Uni- 
versity of Colorado at Boulder, to use certain records 
obtained in Rio Blanco County by an expedition under his 
charge in the summer of 1909. 
While there is already a long list of mammals for our State, 
it is not at all unlikely that it may be added to; and even if 
tliis is not the case, there is yet much to be learned as to the 
