lyon] the hares and their allies 337 



Sylvilagus (Microlagus) bachmani ubericolor (Miller). 

 Sylvilagus (Microlagus) cerrosensis (Allen). 

 Sylvilagus (Microlagus) cinerascens (Allen). 

 Sylvilagus (Microlagus) peninsularis (Allen). 



LiMNOLAGUs aquaticus (Bachman). 



Limnolagus aquaticus attwateri (Allen). 



Limnolagus palustris (Bachman). 



Limnolagus palustris paludicola (Miller and Bangs). 



Limnolagus tehnalemoniis (Elliot). 



Brachylagus idahoensis (Merriam). 



Caprolagiis hispidus (Pearson). 



Pronolagus crassicaudatus (Is. Geoffroy). 

 Pronolagus crassicaudatus curryi (Thomas). 

 Pronolagus crassicaudatus nyikse (Thomas). 



Romerolagus nelsoni Merriam. 



Ncsolagus netscheri (Jentink). 



Pentalagus furnessi (Stone). 



Ochotona (Ochotona) curzonije (Hodgson). 

 Ochotona (Ochotona) daurica (Pallas).^ 

 Ochotona {Ochotona) koslozvi Biichner. 

 OcHONOTA (Ochotona) ladacensis Giinther. , 

 Ochotona (Ochotona) melanostoma Biichner. 



Ochotona (Pika) alpina (Pallas). 

 Ochotona (Pika) collaris (Nelson). 

 Ochotona (Pika) cuppes Bangs. 

 Ochotona (Pika) hyperboreus (Pallas). 

 Ochotona (Pika) kolymensis Allen. 

 Ochotona (Pika) littoralis (Peters). 

 Ochotona (Pika) princeps (Richardson). 

 Ochotona (Pika) pusilla (Pallas). 

 Ochotona (Pika) saxatilis Bangs. 

 Ochotona (Pika) schisticeps (Merriam). 



Ochotona (Conothoa) crythrotis Biichner. 

 Ochotona (Conothoa) roylei (Ogilby). 



Ochotona rufescens (Gray). 

 Ochotona rutila (Severzow). 



IV. GENERAL CONSIDERATION OF THE SKELETON AND 

 TEETH OF THE DUPLICIDENTATA 



SKULL 

 The skulls of the two families Ochotoiiidas and Leporidas are 

 widely different in nearly every respect, and were it not for the 

 structure of the teeth and the number of the upper incisors there 

 would be little to indicate that the two groups were closely related. 

 The skulls of members of both of these families have so often been 

 described and figured that there is here no need of a general 

 description of that important part of their osteology, which will be 

 given later in regard to less well known parts. 



^ An earlier name for ochotona the type. 



