Allen.] 294 [February 4, 



21. Cynomys ludovicianus. 



"Arctomys ludovicianus Ord, Guthrie's Geog. (2d Am. Ed.), II, 292, 



303, 1815." 

 Cynomys ludovicianus Baird, Mam. N. Amer., 331, 1857. 

 Cynomys socialis and grisea Raf., Am. Month. Mag., n, 45, 1817. 

 Arctomys missouriensis Warden, Descrip. U. S., v, 627, 1820. 

 Arctomys latrans Harlan, Faun. Am., 306, 1825. 



Hab. The great plains east of the Rocky Mountains, from south- 

 ern Texas nearly to the British Boundary. 



22. Cynomys columbianus. 



"Arctomys columbianus Ord, Guthrie's Geog. (2d Am. Ed.), II, 292, 



302, 1815." 

 Anisonyx brachyura Raf., Am. Month. Mag., ii, 45, 1817. 

 Arctomys Lewisi Aud. and Bach., Quad. N. Am., in, 32, 1853. 

 Cynomys Gunnisoni Baird, Proc. Acad. Nat. Sci. Phila., vn, 334, 

 1855. — Ibid., Mam. N. Am., 335, 1857. 

 Hab. The parks and plains within and west of the Rocky Moun- 

 tains to the plains of the Columbia. 



23. Arctomys monax. 



Arctomys monax Linn., Syst. Nat. (10th ed.), I, 601, 1758. — Baird, 



Mam. N. Am., 339, 1857. 

 Arctomys empetra Schreber, Saugt., iv, 143, 1774. 

 Arctomys pruinosus Gmelin, Syst. Nat., I, 144, 1788. 

 "Arctomys melanops Kuhl, Beitr., 64, 1820." 



Hab. Eastern North America, from Hudson's Bay to Virginia, 

 and west to the Missouri River. 



24. Arctomys caligatus. 



Arctomys caligatus Eschscholtz, Zool. Atlas, n, 1, 1829. 



Arctomys pruinosus Richardson, Zool. Journ., in, 518, 1828 (nee 



Gmelin). (In part only.) 

 Arctomys okanaganus King, Narr. Back's Journ., n, 257, 1836. 

 Hab. Puget's Sound northward, west of the Rocky Mountains. 



25. Arctomys flaviventer. 



Arctomys flaviventer Aud. and Bach., Proc. Acad. Nat. Sci. Phila., I, 

 99, 1841. — Baird, Mam. N. Amer. 343, 1857. 

 Hab. Rocky Mountains, west to the Pacific Coast. 





