RODENTIA HYSTRICIDAE ERETHIZON EPIXANTHUS. 



571 



The following table will illustrate the peculiarities of the nasals above referred to : 



This species was first separated from the common American porcupine, by Brandt, in 1835. 

 It appears well worthy of specific distinction. Brandt's specimens came from California and 

 Unalaschka. This will give a wide range to the species, as it probably replaces E. dorsatus 

 everywhere, from the Upper Missouri, north and west. 



List of specimens. 



Measurements taken before skinning. 



