MAMMALS OF THE MEXICAN BOUNDAEY. 



497 



Colorado Desert, where we camped for several days, were numerous 

 heaps of mussel shells, such as muskrats leave about their feeding 

 grounds. 



Muskrats have long been known to inhabit the waters of the Colo- 

 rado River, both above and below Yuma, and in a letter from Mr. 

 Herbert Brown, dated Yuma, Arizona, November 18, 1900, I am 

 informed that he had found them at Yuma. 



Measurements of 10 specimens of Fiber zibethicus pallidus. 



Museum 

 number.o 



Locality. 





O >H 



Jd o3 





200 

 225 

 232 

 241 



408 

 451 

 454 

 464 



2343 

 2344 

 2345 

 2346 



(") 



1765 

 1768 

 1762 

 1767 



Fort Verde, Arizona . 



2347 I 1766 



2348 1 1763 

 12181 i 1764 



Beaver Creelc, Verde Valley, Arizona.. 



Fort Verde, Arizona 



do 



Beaver Creek, Verde Vallev, Arizona 



Fort ^'erde, Arizona . 



....do.; 



do 



do 



.do. 



1884. 

 June 26 



1885. 

 June 15 

 July 22 

 Aug. 19 

 Sept. 17 



1886. 

 June 4 

 Aug. 23 

 Aug. 28 

 Sept. 20 



1888. 

 Mav 15 



mm. 

 203 



200 

 197 

 171 

 208 



mm. 

 21 



212 I 17.5 

 210 i 18 



213 1 20 



mm. 

 62 



70 



65 



a American Museum of Natural History. 

 b Skull in skin. 



■^Cotypc. 



d Young of the year. 



FIBER ZIBETHICUS RIPENSIS Bailey. 



PECOS MUSKRAT. 



Fiber zibethicus ripensis Bailey, Proc. Biol. Soo. Washington, XV, p. 119, June 2^ 

 1902 (original description). — Miller and Reiin, Proc. Bost. Soc. Nat. Hist.,XXXi 

 Aug. 27, 1903, p. 91 (Syst. Results Study N. Am. Mam. during the years 1901 and 

 . 1902). 



Type-locality. — Pecos River at Carlsbad, formerly Eddy, Eddy 

 County, New Mexico. 



Description. — Mr. Vernon Bailey described this subspecies as fol- 

 lows : 



Type from the Pecos River at Carlsbad (Eddy), New Mexico, No. 109012, U. S. National 

 Museum, Biological Survey Collection, male ad. Collected July 25, 1901, by Vernon Bailey. 

 Original No. 7757. 



General characters. — Size small; color paler than in zibethicus, but darker than in paUidiis; 

 skull narrow; incisors heavy. 



30639— No. 56—07 m 32 



