232 FIELD MUSEUM or NATURAL HISTORY ZOOLOGY, VOL. XI. 



Map illustrating approximate distribution of Muskrats (Fiber) in eastern United States and 



Canada. 



Fiber zibethicus (LiNN.). Type locality Eastern Canada. Description as previous- 

 ly given. 

 Fiber z. hudsonius PREBLE. (N. Amer. Fauna, No. 22, 1902, p. 53.) Type locality 



Fort Churchill, Keewatin, Canada. Smaller and paler than zibethicus, with 



smaller molars. 

 Fiber z. cinnamominus HOLLISTER. (Proc. Biol. Soc. Wash., XXIII, 1910, p. 126.) 



Type locality Wakeeney, Trego Co., Kansas. Coloration pale; smaller and 



more reddish than zibethicus. 

 Fiber z. aquilonius BANGS. (Proc. N. Eng. Zool. Club, I, 1899, p. 1 1.) Type locality 



Rigoulette, Hamilton Inlet, Labrador. Darker and upper parts more black- 

 ish than zibethicus; hind foot smaller. 

 Fiber z. macrodon (MERRIAM). (Proc. Biol. Soc. Wash., XI, 1897, p. 143.) Type 



locality Lake Drummond, Dismal Swamp, Norfolk Co., Virginia. Color 



darker and richer than zibethicus; teeth larger. 

 Fiber z. rivalicius BANGS. (Proc. Bost. Soc. Nat. Hist., XXVI, 1895, p. 541.) Type 



locality Burbridge, Plaquemines Parish, Louisiana. Smaller than zibethicus 



and coloration more dull and sooty. 

 Fiber obscurus BANGS. (Proc. Biol. Soc. Wash., IX, 1894, p. 133.) Type locality 



Codroy, New Foundland. Smaller than zibethicus; upper parts darker, and 



under oa.rts and sides less ferruginous. 



