GEOMYIDA—THOMOMYS TALPOIDES. 623 
sooty-blackish there. The Pacific Coast race is a rich dark-brown animal, 
muddy-bellied, with dusky tail and feet, wholly or in part, and sooty about 
the mouth. The Southern Interior race is usually a rich tawny or fulvous 
animal, with partly dark tail or feet, or both, sooty mouth-parts, and white 
pouches. This race is particularly variable in color; and, in every respect of 
color, all the races show much variation, and, moreover, intergrade completely. 
The various forms under which the genus Thomomys is exhibited may 
be discriminated by the following characters :— 
ANALYSIS OF SPECIES AND VARIETIES. 
A. Large. Hind foot au inch or more long. Tail at least one-third as long as head 
and body. Above brown, reddish, &c. Below gray, brown, reddish, &c. (not 
white). Iarsin a blackish area well developed ..-.-. ...-.. ..-2.. 22-06 se-e- 1, TALPOIDES. 
a. Six to eight inches long; fore claws highly developed (0.45 to 0.55 long), making 
the hand about as long as the foot. Color of the house-rat, with white tail and 
feet, and usually white about the mouth and throat; no contrasts of dark color 
apettathemouth: «(Northern Interior)=--~soss.ccseses secese sacces cases weoe ce a. talpoides, 
b. Seven to nine inches long; fore claws less developed, usually under 0.50, leaving 
the hand shorter than the foot. Reddish-brown, the belly muddy-brownish, 
feet and tail usually not entirely white; mouth-parts dark, contrasting with 
white of the pouch-lining. (Pacific Coast).............---.-----. .eecee eee eee b. bulbivorus, 
ce. Smaller on an average; usually six to seven inches long. Fore claws about 0.40 
or less, leaving the hand decidedly shorter than the foot, Rich fulvous, or even 
fawn-color, the same below but paler, variously obscured on the back with 
dusky ; tail and feet usually dark; face and mouth-parts sooty-blackish, sharply 
contrasting with white pouch-lining. (Southern Interior and Lower Cali- 
REO rsri) See een Mea aos eal eh ee A abs Ae aie Ss? c. umbrinus, 
B. Small; decidedly less than six inches long. Hind foot about 0.75; fore foot still 
less. Tail scarcely one-fourth as long as the head and body. Above, pallid 
yellowish-gray, with a shade of light brown; below, entirely white; feet and 
tail white. Ears minute, not in a blackish area. Nose blackish. (Bridger’s 
URS WOU Y MOUNTAINS) = s-<s-s1--sas5 ese sce ese-sn scene On c0O Gacneo ROSOO abe 2. CLusIUs. 
THOMOMYS TALPOIDES, (Rich.) Baird.* 
: Northern Pocket Gopher 
Cricetus talpoides, Ricu., Zool. Journ. iii, No. 12, Jan.—Apr. 1828, 518. (Plumbago-colored.) 
“Geomys talpoides, Ricn., F. B.-A. i, 1829, 204; Rep. Brit. Assoc. for 1836, vi, 1837, 150, 156. (Same as the pre- 
ceding, but “ Florida” assigned wrongly as a locality.)—DrKay, N. Y. Fn. 1842, 92. (Com- 
piled from Richardson.)—Scuinz, Synop. Mamm. ii, 1845, 137. (Compiled from Rich- 
ardson.)—LrContr, Proc. Acad. Nat. Sci. Phila. vi, 1852, 162. (Compiled from Richardson.) 
Saccophorus talpoides, Fiscu., Synop. Mamm, 1829, 588 (marked “ 383”). (Compiled from Richardson.) 
Ascomys talpoides, WAGN., Suppl. Schreb. iii, 1843, 890, (Compiled from Richardson.) > 
Pscudostoma talpoides, AUD. & Bacn., Q.N. A. iii, 1853, 43, pl. 110. (Compiled from Richardson ; figure 
from the type-specimen. ) 
Geomys (Thomomys) talpoides, GIEBEL, Siing. 1855, 530. (Compiled from Richardson.) 
Thomomys talpoides, Baus, M. N. A. 1857, 403. (Compiled from Richardson.)—Couxs, Proe. Phila. Acad. 
1875, 135.—Cougrs, Powell’s Rep. Colorado R. 1875, 250 (monographie ; Richardson’s species 
identified, described, and discussed). 
* Special paper : “Short characters of a few Quadrupeds procured on Capt. Franklin‘s late Expe- 
dition.” <The Zoological Journal, iii, No. 12, Jan.—Apr. 1828, pp. 516-520. 
