188 U. S. NATIONAL MUSEUM BULLETIN 205 



Subgenus CYNOMYS Rafinesque 



Cynomys ludovicianus ludovicianus (Ord)* 



1815. Arctomys ludoviciana Ord, in [Guthrie], A new geographical, historical, 

 and commercial grammar ; . . . , Philadelphia, ed. 2, vol. 2, p. 292. (De- 

 scription on p. 302.) 

 1858. Cynomys ludovicianus Baird, Mammals, in Rep. Expl. Surv. Railr. to 



Pacific, vol. 8, pt. 1 (Washington, 1957), p. xxxix, July 14, 1858. 

 1884. Cynomys ludovicianus True, Proc. U. S. Nat. Mus., vol. 7 (App., Circ. 



29), p. 593, Nov. 29, 1884. 

 1905. Cynomys pyrrotrichus Elliot, Proc. Biol. Soc. Washington, vol. 18, p. 



139, Apr. 18, 1905. (White Horse Spring, Woods County, Okla.) 

 Type Locality. — Upper Missouri River ("vicinity of the Missouri, and 

 throughout the greater part of Louisiana") . Range. — Great Plains region, south 

 from Frenchman River, southern Saskatchewan, Canada (Soper, Journ. Mamm., 

 vol. 25, No. 1, p. 47, Feh. 18, 1944) , to west-central Texas (Mason County to 

 eastern Pecos Valley) ; east to about long. 97° W. in Nebraska, Kansas, and 

 Oklahoma; west to Rocky Mountains in central Montana, Wyoming, and Colo- 

 rado, and in extreme eastern New Mexico. Zonal range, chiefly Upper Sonoran, 

 but also ranging into Transition and Lower Sonoran. Introduced colonies exist, 

 or have been reported as formerly existing, in Sac County and at Burlington, 

 Iowa; near Monroe, La.; at Seneca, S. C. ; and on Nantucket Island, Mass. 



Cynomys ludovicianus arizonensis Mearns* 



1890. Cynomys arizonensis Mearns, Bull. Amer. Mus. Nat. Hist., vol. 2, p. 

 305, Feb. 21, 1890. 



1892. C[ynomys] ludovicianus arizonensis Merriam, Proc. Biol. Soc. Wash- 

 ington, vol. 7, p. 158, July 27, 1892. 



Type Locality. — Point of Mountain, near Willcox, Cochise County, Ariz. 

 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, N. Mex. ; east to Pecos Valley; west to Huachuca, Ariz.; 

 south to San Diego and Casas Grandes, Chihuahua, and to Presidio County, Tex. 



Cynomys mexicanus Merriamf * 



1892. Cynomys mexicanus Merriam, Proc. Biol. Soc. Washington, vol. 7, p. 

 157, July 27, 1892. 



Type Locality.— La Ventura, Coahuila, Mexico. Range. — Southeastern Coa- 

 huila and northern San Luis Potosi, Mexico ; north to Saltillo ; south to Vanegas. 



Subgenus LEUCOCROSSUROMYS Hollister 



1916. Lcucocrossuromys Hollister, North Amer. Fauna No. 40, p. 23, June 

 20, 1916. (Type, Spermophilus gunnisoni Baird.) 



Cynomys leucurus Merriamf* 



1890. Cynomys leucurus Merriam, North Amer. Fauna No. 3, p. 59, Sept. 11, 



1890. 

 1898. Cynomys lewisii J. A. Allen, Bull. Amer. Mus. Nat. Hist., vol. 10, p. 455, 



Nov. 10, 1898. (Not Arctomys lewisii Audubon and Bachman, a Marmota 



