G28 monographs of north American rodentia. 



THOMOMYS TALPOIDES UMBRINUS, (Rich.) Coues. 

 Southern Pocket Gopher. 



Geomys umbrinus, Rich., F. B. A. i, 1829, 202; Rep. Brit. Assoc, for 1836, vi, 1837, 150. ("Cadadaguios, 



Southwestern Louisiana" — more likely Texas or New Mexico.)— Watekh., Charlesw. Mag. 



N. II. iii, 1839, 596, f. 71 (skull).— DeKav, N. Y. Fn. 1842, 92. (Compiled from Richardson.)— 



Scmxz, Syn. Mamm. ii, 1845, 1:57. (Compiled from Richardson.)— LeC., Proc. Acad. Nat. 



Sci. Phila. 1852, 164 (Compiled from Richardson.) 

 Jscomys umbrinus, Wacv., Soppl. Schreb. iii, 184:!. 389. (Compiled.) 

 Pseudoatoma umbrinus, Aid. & Bach., iii, 1854, 307. (Compiled from Richardson.) 

 Geomys (Thomomys) umbrinus, Gieb., Siiug. 1855, 530. (Compiled from Richardson.) 

 Thomomys umbrinus, Baird, M. N. A. 1857, 399 (redescribed from numerous New Mexican specimens). — 



Baird, U. S. Mex. B. Survey, ii, pt. ii, 1859, Mamm. 41.— Gerr., Cat. Bones Br. Mas. 1862,228. 

 Thomomys talpohles umbrinus, Coles, Proc. Phila. Acad. 1875, 137. — Coues, Powell's Rep. Colorado R. 



1875, 261 (monograph).— Coues & Yarrow, Wheeler's Rep. Expl. YV. 100 Merid. "1875" 



(= 1876), 111 (New Mexico, Arizona, &.c). 

 Geomys fulrus, Woodh., Proc. Acad. Nat. Sci. Phila. 1852, 201 (San Francisco Mountains, Arizona) ; Rep. 



Expl. Zuni and Colorado R. 1853, 51, pi. 5 (the same). 

 rseufosloma (Geomys) fulrus, Aud. & Bach., Q. N. A. iii, 1854, 300. (Copied from Woodbouse.) 

 Thomomys fulrus, Baird, M. N. A. 1857, 402. (Describes Woodhouse's type, and other specimens, from 



California.) — Baird, U. S. Mex. Bound. Snrv. ii, pt. ii, 1859, Mamm. 41. — Kenn., P. R. R. Rep. 



x, 1859, Whipple's Route, Mamm. 14, pi. 12, f. 2.— Cocks, Am. Nat. i, 1867, 394 (habits).— 



Codes, Proc. Acad. Nat. Sci. Phila. 1867, 135 (Fort Whipple, Arizona). 



Varietal chars. — Averaging decidedly smaller than either of the fore- 

 going. Length of head and body about six inches, rarely seven. Fore feet 

 averaging decidedly less than the hind feet ; longest claw oftener under than 

 over 0.40. Color variable, from a nearly uniform rich fawn-color all over, or 

 even intense reddish-chestnut, to various tawny-brown shades, with or with- 

 out a blackish dorsal area; belly merely a paler shade of the color of the 

 upper parts, or much as described under bulbicorus. (Occasionally quite 

 gray, much as in typical talpoides ; sometimes lustrous coal-black all over.) 

 Mouth-parts, and often whole face, blackish, except sometimes immediately 

 around the lips, strongly contrasting with the white lining of the pouch. 

 Tail usually more or less like the body. 



Habitat. — Southern Colorado, Southern Utah and Southern Nevada, 

 Western Texas, New Mexico, Arizona, and Lower California to Cape Saint 

 Lucas. Southward extension into Mexico undetermined. 



No other form of the genus varies so much in color as this one. The 

 known variations are all given in the original memoir, and Drs. Coues and 

 Yarrow have carefully described the normal or usual style of coloration in the 

 Report above cited. 



