TABLE OF CONTENTS. 



Pages. 



Characters 01' this family Hystricida- 385-386 



Genus Erethizon 386-388 



Synonymy of Erelh izon dorsatus 388-389 



Canada Porcupine ( E. dorsatus var. dorsatus) 389-391 



Western Porcupine (E. dorsatus var. epUanthus) 391-39;} 



General remarks on Erethizon dorsatus and its varieties 392-394 



Measurements of skulls of E. dorsatus var. dorsatus 394-394 



Measurements of skulls of E. dorsatus var. epixanthus 395-395 



List of specimens of E. dorsatus var. dorsatus 396-396 



List of specimens of E. dorsatus var. epixanthus 397-397 



Extinct species of North American Porcupines 397-398 



Erelh i:on cloacin us 398-398 



383 



