COUES ON GEOMYS AND THOMOMYS T. BULBIVOEUS. 259 
Thomomt/s J)Ha; LKSS., Nouv. Man. R. Aniiii. 1842, 119. (Compiled.) BAIRD, Proc. Acad. Nat. Sci. Phila. 
1855, 335. (Subsequently identified the same with bulbivorua.) 
(icomys fttliginosus, Scuixz, Syn. Manim. ii, 1845, 136. (Based on douglasi; name altered for no good 
reason.) 
Thomomys laticeps, BAIRD, Proc. Acad. Nat. Sci. Phila. 1855, 335; M. N. A. 1857, 392. (Huiuboldt Bay.) 
KENN., P. R. R. Rep. x, 1859, Whipple's Route. Mamm. 13, pi. 12, f. 1 (by error marked 
"2" in text). (Same as the foregoing.) 
Geomys douglasii, RICH., F. B. A. i, 1829, 200, pi. 18 C, ff. 1-6 (skull) ; Zool. Voy. Blossom, 1839, 9. 
(Near mouth of Columbia; Fort Vancouver.) LECOXTE, Proc. Acad. Nat. Sci. Phila. 1852, 
162. (Compiled from Richardson.) 
Geomys douglasi, DsKAY, N. Y. Fn. 1842, 92. (Compiled from Richardson.) 
Ascomys dougiasii, WAGX., Suppl. Schreb. iii, 1843, 392. (Compiled.) 
Pseudostoma dougiasii, AUD. & BACH., Q. N. A. iii, 1853, 24, pi. 105 (altogether too brightly colored). 
(Mainly compiled from Richardson.) 
Gcotnys (Tliomomys) douglasi, GIEBEL, Siiug. 1855, 531. (Compiled.) 
TlwiHomys douglassii, BAIRD, M. N. A. 1857, 394. (Minute description of specimens from Washington and 
Oregon Territories.) SUCKL., P. R. R. Rep. xii, 1860, pt. ii, pp. 100, 126. 
DIAGNOSIS. ^Coloration heavier than in the foregoing ; general cast 
reddish-brown, lined with dusky on the back; the head usually darker than 
the rest of the upper parts ; on the sides, the color giving way to a clearer 
tawny-brown, which occupies the belly also, there overlying the plumbeous 
roots of the fur as. a strong wash. Face and mouth-parts dusky, or even 
sooty-blackish, contrasting with the white lining of the pouches. No pure 
white on the under parts. Tail and feet usually incompletely whitish, or 
quite dusky. If anything averaging rather larger than true talpoides. Hand 
rather shorter than the foot, owing to less development of the claws, which 
are only about 0.40 long. 
HABITAT. Pacific coast and slopes of the United States, from Washing 
ton Territory to Southern California. 
Description (from San Francisco specimens). Having already sufficiently 
insisted upon the fact that there is no decided difference in size or shape- 
between this form and the last, beyond an average less development of the 
fore claws, there is little to be said by way of description, except to amplify 
the foregoing points of coloration. The extreme of the bulbivorus branch 
of this species is readily recognized by a warmth and intensity of coloration 
not known to occur in specimens from the Northern Interior. The color 
varies a great deal in different specimens, but is never like the clear mouse- 
gray seen in talpoides. It is in reality an intimate mixture of yellowish-brown 
and dark-brown or blackish. Above, the pointing of the fur conceals the 
plumbeous bases of the hairs; below, this plumbeous shows, overlaid with a 
