From the Proceedings of the Boston Society of Natural History, Vol. XVII, 

 February 17, 1875. 



SYNOPSIS OF THE AMERICAN LEPORID^E. BY J. A. ALLEN. 



The following synopsis of the species and varieties of American 

 Leporidas is based mainly on the specimens of this group contained in 

 the museum of the Smithsonian Institution at Washington, but those 

 in the Museum of Comparative Zoology at Cambridge have also 

 been used, as well as all accessible material from other sources. The 

 present paper is an abstract of a monograph, in which the synonomy 

 will be given in full, with extended tables of measurements and 

 detailed descriptions. 



Analysis of the Species and Varieties. 



I. Skull much arched above; breadth one half the length; post- 

 orbital processes distinct, not soldered with the skull; nasals 

 of medium length, their length equal to about four-fifths of 

 the width of the skull. 



A. Hind feet longer than the head. Size large. Postorbital 

 processes divergent, not in contact with the skull poste- 

 riorly. Pelage white in winter. 



