*_Geomys garbanii_ White and Downs, 1961. Contrib. Sci., Los Angeles Co. Mus., 42:1-34, June 30. Type from Vallecito Creek local fauna (middle Pleistocene), San Diego County, California. *_Geomys bisulcatus_ Marsh, 1871. Amer. Jour. Sci., 3:121. Type from Loup River fossil beds, near Camp Thomas, Nebraska (probably late Pleistocene). _bursarius_ species-group *_Geomys parvidens_ Brown, 1908. Mem. Amer. Mus. Nat. Hist., 9:194. (An extinct subspecies of _Geomys bursarius_ according to White and Downs, 1961:6). Type from Conard Fissure local fauna (late Pleistocene), northern Arkansas. _Geomys bursarius_ (Shaw, 1800). Trans. Linn. Soc. London, 5:227. Type from somewhere in Upper Mississippi Valley, North America. _Geomys arenarius_ Merriam, 1895. N. Amer. Fauna, 8:139, January 31. Type from El Paso, El Paso County, Texas. _Geomys personatus_ True, 1889. Proc. U. S. Nat. Mus., 11:159, January 5. Type from Padre Island, Cameron County, Texas. _pinetis_ species-group _Geomys pinetis_ Rafinesque, 1806. Amer. Monthly Mag., 2 (1):45, November. Type locality restricted to Screven County, Georgia. _Geomys colonus_ Bangs, 1898. Proc. Boston Soc. Nat. Hist., 28:178, March. Type from Arnot Plantation, about 4 mi. W St. Marys, Camden County, Georgia. _Geomys cumberlandius_ Bangs, 1898. Proc. Boston Soc. Nat. Hist., 28:180, March. Type from Stafford Place, Cumberland Island, Camden County, Georgia. _Geomys fontanelus_ Sherman, 1940. Jour. Mamm., 21:341, August 13. Type from 7 mi. NW Savannah, Chatham County, Georgia. Genus =Orthogeomys= Merriam 1895. _Orthogeomys_ Merriam, N. Amer. Fauna 8:172, January 31. 1895. _Heterogeomys_ Merriam, N. Amer. Fauna 8:179, January 31 (type, _Geomys hispidus_ Le Conte, 1862). 1895. _Macrogeomys_ Merriam, N. Amer. Fauna 8:185, January 31 (type, _Geomys heterodus_ Peters, 1865). _Type._--_Geomys scalops_ Thomas, 1894, from Tehuantepec, Oaxaca, México. _Chronologic range._--Late Pleistocene Wisconsin deposits (San Josecito Cave local fauna, Nuevo León, México) to Recent. _Description and discussion._--Species of this genus are of medium to large size. The skull is strongly dolichocephalic in most species; the posterior part of the skull is especially narrow. The angular processes are remarkably short, especially in relation to the length of the mandible. The nasals and rostrum are relatively broad and heavy. The pelage is coarse, and often hispid. In some species the hairs are so sparsely distributed that the body appears almost naked, and none has so dense a covering of hair as do other genera. The genus occurs entirely within the tropical life-zones, and most of the external features seem to be associated with adaptation to tropical conditions.