PREFACE. XXIX 



The following table will serve to indicate the additions in the list to the known species of 

 North American mammals, as compared with the latest general work on the subject : 



Species described here, as new, for the first time 35 



Species described in 1855, from the same collection 17 



i 



Total of new species in the Smithsonian collection not mentioned by Audubon and Bachman 52 

 Kecognized species previously described, not mentioned by Audubon and Bachman 18 



Total of North American species additional to the list of Audubon and Bachman 70 



The entire number of species mentioned by Audubon and Bachman in the Quadrupeds of 

 North America, exclusive of varieties, is 197, of which about 160 were figured, the remainder 

 consisting either of species previously described by the authors, but not procurable for purposes 

 of illustration, or else copied from others, to render their work complete. 



The total .number of species of North American mammals represented in the Smithsonian 

 collection is very nearly 220. 



WASHINGTON, D. 0., July 20, 1857. 



