No. 3. — SYSTEMATIC RESULTS OF THE STUDY 
OF NORTH AMERICAN LAND MAMMAL'S 
DURING THE YEARS 1901 AND 1902. 
BY GERRIT S. MILLER, JR., AND JAMES A. G. REHN. 
Progress in the study of the North American mammal fauna 1 
has been exceptionally rapid during the years 1901 and 1902. So 
great an advance in this field has probably never before been made 
in a like period, even during the remarkable activity of the preceding- 
twelve years. Since 1900 there has been published the first general 
work on North American mammals subsequent to that of Baird; 
many changes in nomenclature have been found necessary, and the 
elaboration of material has resulted in the discoverv of over 300 
forms unknown two years ago. 
To present a summary of this work, much of which has been 
issued in short special articles, is the object of this paper. So far 
as possible all personal opinion is excluded, and the facts are stated 
with no other end in view than that of history. While this method 
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entails occasional difficulties and apparent inconsistencies, it is 
undoubtedly preferable to any attempt at a critical treatment of the 
subject that could now be made. 
A word of explanation in regard to the form adopted. The 
entries are made in the order followed in our Svstematic results of 
the studv of North American land mammals to the close of the 
year 1900 (Proc. Boston soc. nat. hist., vol. 30, p. 1-352, Decem¬ 
ber 27, 1901). All names recorded there and rejected during the 
years 1901 and 1902 are printed in italics, followed, except in case 
of elimination, by the current name. This is in heavy faced type. 
Additions are entered in the same type as other accepted names, 
but are numbered. 2 The svstem of citation is the same as that in the 
earlier paper, but duplication of references there published is as far 
as possible avoided. The members of genera revised since 1900 are 
1 As more natural than the Panama Railroad, the boundary between Panama 
and Cauca is here adopted as the southern limit of this fauna. 
2 Among these are included three, Odocoileus virgultis, Proechimys centralis 
panamensis, and Ochotona minimus inadvertently omitted from the original 
paper. 
