LETTER OF TRANSMITTAL 



Cambridge, Mass., April 3, 1876. 



Sir: I transmit herewith for publication my report on the North Amer- 

 ican Leporidce. As but two species of this family occur south of the United 

 States that are not also found north of the United States and Mexican boundary, 

 these have also been included, thereby rendering the present memoir a mono- 

 graph of the Leporidce of the New World. 



The material on which this report is based is primarily that of the 

 National Museum, to which, through the kindness of the officers of the Smith- 

 sonian Institution, I have had the fullest .access. This has been supplemented 

 by that of the other principal collections of this country, by far the most 

 important of which is that of the Museum of Comparative Zoology, Cam- 

 bridge, Mass., of which also I have been permitted the freest use. 



It gives me pleasure to mention in this connection that a large part of 

 the material from the Trans-Mississippian portions of the United States has 

 been gathered either personally by yourself or under your immediate direction 

 and auspices. 



I am, sir, very respectfully, yours, 



J. A. ALLEN. 



Dr F. V. Hayden, 



United States Geologist, etc., etc., Washing/on, D. C. 



2H5 ;,; 



