NORTH AMERICAN RECENT MAMMALS. 197 



*Cynomys ludovicianus ludovicianus — Continued. 



Range. — Great Plains region of western United States, south 

 from near the Canadian border in Montana to west-central 

 Texas (Mason County to eastern Pecos Valley) ; east to about 

 the ninety-seventh meridian in Nebraska, Kansas, and 

 Oklahoma; west to the Rocky Mountains in central Montana, 

 Wyoming, and Colorado, and in extreme eastern New Mexico. 

 Chiefly Upper Sonoran, but also ranging into Transition and 

 Lower Sonoran Zones. Introduced colonies exist, or have 

 been reported as formerly existing, in Sac County and at 

 Burlington, Iowa; near Monroe, Louisiana; at Seneca, South 

 Carolina; and on Nantucket Island, Massachusetts. 



*Cynomys ludovicianus arizonensis (Mearns). 



1890. Cynomys arizonensis Mearns, Bull. Amer. Mus. Nat. Hist., 

 vol. 2, p. 305. February 21, 1890. 



1916. Cynomys ludovicianus arizonensis Hollister, North Amer. 

 Fauna, No. 40, p. 19. June 20, 1916. 



Type Locality. — ^Point of Mountain, near Wilcox, Cochise 

 County, Arizona. 



Range. — Southeastern Arizona, southern and central New 

 Mexico, southwestern Texas, and adjacent portions of Sonora 

 and Chihuahua, Mexico. North to San Pedro and Santa 

 Rosa, New Mexico; east to the Pecos Valley; west to Hua- 

 chuca, Arizona; south to San Diego and Casas Grandes, 

 Chihuahua, and to Presidio County, Texas. 



t*Cynomys mexicanus Merriam. 



1892. Cynomys mexicanus Merriam, Proc. Biol. Soc. Washington, 



vol. 7, p. 157. July 27, 1892. 

 Type Locality. — La Ventura, Coahuila, Mexico. 

 Range. — Southeastern Coahuila and northern San Luis Potosi, 



Mexico. North to Saltillo; south to Vanegas. 



Subgenus LEUCOCROSSUROMYS Hollister. 



1916. Leucocrossuromys Hollister, North Amer. Fauna, No. 40, 

 p. 23. June 20, 1916. Type, Spermophilus gunnisoni Baird. 



t* Cynomys leucurus Merriam. 



1890. Cynomys leucurus Merriam, North Amer. Fauna, No. 3, 

 p. 59. September 11, 1890. 



1898. Cynomys lewisii Allen, Bull. Amer. Mus. Nat. Hist., vol. 

 10, p. 456. November 10, 1898. (Not Arctomys lewisii 

 Audubon and Bachman, a Marmota from the "shores of the 

 Columbia River;" see HolUster, North Amer. Fauna, No. 40, 

 p. 26, June 20, 1916.) 



Type Locality. — Fort Bridger, Uinta County, Wyoming. 



