MAMMALS OF THE MEXICAN BOUNDARY. 



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 Ynma, 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 Film- zibethicus paUidus. 



Museum 

 number." 



Locality. 



Date. 



ige. 





200 

 225 

 232 



241 



451 

 454 

 464 



2343 

 2344 

 2345 



2346 



CO 



L765 



1768 

 1762 



1767 



Fori Verde, Arizona rum- 26 



1885. 

 Beaver Creek, Verde Valley, Arizona.. June 15 



Fort Verde, Arizona inly 22 



do Aug. I! 1 



Beaver Creek, Verde Valley, Arizona. . Sept. 17 



L886. 



2347 

 2348 

 12181 



2349 



1766 

 1763 



1764 



Fort Verde, Arizona . 



....do 



....do 



.. .do 



.do. 



June 4 



Aim. 2;; 

 A ut;. 28 

 Sept. 211 



a American Museum of Natural History. 

 b Skull in skin. 



cCotype. 



d Young of tli> 



FIBER ZIBETHICUS RIPENSIS Bailey. 

 PECOS MUSKRAT. 



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

 1902 (original description). — Miller and Rkhx. Proc. Bost. Soc. Nat. Hist.,XXXJ 

 Aug. 27, 1903, p. 91 (Syst. ResultsStudy X. Am. Mam. during the years L901 and 



1902). 



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

 County, New Mexico. 



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

 lows: 



Typt from the P.ecos Rivera! Carlsbad (Eddy), New Mexico. No. 109012, V. S. National 

 Museum, Biological Survey Collection, male ad. Co I Ice (cd July2o, 1001, by Vernon Bailex . 

 Original No. 7757. 



General characters. Size small: color paler than in zibethicus, bui darker than in pattidus; 



skull narrow: incisors heavy. 



30639— Xo. .56—07 M 32 



