232 Field Museum or Natural History — Zoology, Vol. XL 



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. 11.) 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 2. 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 locaHty — 

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

 under parts and sides less ferruginous. 



