126 HoUister — A Neiv Muskratfrom the Great Plains. 



lengtli, ',]o C'o.o); length of nasals, lil..) (lil..)); breadth of nasals, 8.(> 

 (8.!>) alveolar length of upper molar series, 14.1* (15). 



Remarks. — This is the mnskrat of the prairie streams and sloughs of 

 the interior (Ireat Plains region. In color it exhibits the maximum 

 amount of reddish, and, with the exception of Fiber z. pallidus of 

 Arizona, the minimum amount of black. It intergrades with Fiber z. 

 zibetliicns and Fiber z. osoyoosensis on the borders of the Great Plains, 

 ^ly thanks are due to Dr. C. Hart Merriam for the privilege of describing 

 this form from his collection. 



Specimens referable to this subspecies have been examined from 

 southern Manitoba, North and South Dakota, eastern INIontana and 

 AVyoming, Nebraska, eastern Colorado, Iowa, Kansas and northern Texas. 



