250 EXPLORATION OF THE CANONS OF THE COLORADO. 
c. 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 California , 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 Pass, 
Rocky Mountains 2. CLUSIUS, n. s. 
THOMOMYS TALPOIDES, (Rich.) Baird. 
Cricctus talpoides, RICH., Zool. Journ. iii, App. 1828, 518. (Plumbago-colored.) 
Geomys talpoides, RICH.. F. B. A. i, 1829, 204 ; Rep. Brit. Assoc. for 1836, v, 1837, 157. (Same as the pro- 
ceding, but "Florida" assigned wrongly as a locality.) DEKAY, N. Y. Fn. 1842, 92. (Com 
piled from Richardson.) SCHINZ, Synop. Mamm. ii, 1845, 137. (Compiled from Rich 
ardson.) LECONTE, Proc. Acad. Nat. Sci. Phila. vi, 1852, 162. (Compiled from Richardson.) 
Saccoplwrus talpoides, FISCH., Synop. Mamm. 1829, 588 (marked " 388"). (Compiled from Richardson.) 
Ascomys talpoides, WAGN., Suppl. Schreb. iii, 1843, 390. (Compiled from Richardson.) 
Pscudostorna talpoides, AUD. & BACH., Q. N. A. iii, 1853, 43, pi. 110. (Compiled from Richardson ; figure 
from the type-specimen.) 
Geomys (Thomomys) talpoides, GIKBEL, Siiug. 1855, 530. (Compiled from Richardson.) 
Thomomys talpoides, BAIRD, M. If. A. 1857, 403. (Compiled from Richardson.) 
Geomys borealis, RICH., Rep. Brit. Assoc. for 1836, v, 1837, 156. (Named, not described. " Saskatchewan.") 
BACHM., Journ. Acad. Nat. Sci. Phila. 1839, 103. (Originally described from Richardson's 
type, "Columbia R.," marked "Pseudostoma borealis, Rich.") DEKAY, N. Y. Fn. 1842, 
92. (Compiled from Bachmau.) SCHINZ, Synop. Mamm. ii, 1845, 136. (Compiled from 
Bachman.) 
Ascomys borealis, WAGN., Suppl. Schreb. iii, 1843, 391. (Compiled.) 
Saccophorus borealis, GRAY, List Br. Mus. 1843, 149 ("Canada;" mere mention, with some wrong syno- 
. nyms). MURIE, P. Z. S. 1870, 80 (as host of (Estrus). 
Pseudostoma borealis, " RICH. MSS." AUD. & BACH., Q. N. A. iii, 1853, 198, pi. 142. (Description and fig 
ure apparently from the original specimens.) 
Thomomys borealis, BAIRD, Mamm. N. A. 1857, 396, pi. 22, figs. 2a-e. (Account from types of " borealis" and 
" townseudii," in Mus. Phila. Acad., with which a Californian specimen, is considered prob 
ably identical.) NEWB., P. R. R. Rep. vi, 1857, 59 (rests on the Californian specimen just 
mentioned). 
