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Show 258 EXPLORATION OF THE OARONS OF THE COLORADO. described, in 1839, by Dr. Bachman, from Richardson's MSS., upon specimens in the Philadelphia Academy, said to be from the "Columbia River.'' These two names may be treated together, as they are unquestionably the same. These specimens, apparently, were figured by Audubon; the plate is too highly colored, the richness of the tint there represented being only matched in strong cases of umbrinus; but exactly the same wrong tawny coloration is on the same author's plate of ''donglasii,'' and need not stand in the lea t in the way of the identification which I make. The same original specimens were taken by Dr. LeConte as the hasis of his Geomys rufeacens, and were examined by Professor Baird, who failed to see any decided difference from "douglasi." I have not taken occasion to handle these specimens myself' ; but Dr. Bachman's original description gives nothing incompatible with the characters of the present species, and the balauce of his account inclines here. From the locality, it is most likely that the e specimens are more or les intermediate between pure talpoides and ''dougla i." It becomes, in fact, a matter of indifference whether we allocate the quotations of '' borealiR '' here or under the next head. Respecting the T. 'rufescens of Maximilian, I have nothing to add to what ha been already ~aid. "Geomys unisulcatus'' of Gray, apparently only a museum-name, is here a~signed by the author himself. The specimens collected by the Unite~ States Geological Survey of the Territories, catalogued by Mr Merriam as '' f'ulvu ·,'' belong here, as I ascertain by inspection. TllOMOMYS TALPOIDES BULBIVORUS, (Rich.) Coues. Diplostoma f bulbivorum, R1cn., F. n. A. i, 1829, 206, pl. 18 B (lottored douglasii by mistako).-Rrcn. Zool. Voy. Blossom, 183!>, pp. !) an<ll:.J." ' ABcomys bul~ivorus, WAON., Suppl. Scllrob. iii, 1843, :l87. (Compiled.) Geomy11 bulbworuB:. Dduv, N. Y: l!~n. 1842, 92. (Co111pi1Qd from Riohardsou.)-ScmNz, Syn. Mnmm. II, 1840>, 13G. (~omp.llod i Juotcs JJ. '' bulbifenw~"; giv~o>s wrong loot~lity).-LICCONTE, Pt·oe. Acad. Nut. 801. Pll•ln. 180>:.!, 162. (Compiled from Riolmnlsou ) PBCildostoma bulbivorum, Auo. & BACH. Q. N A iii U:!"4 '''17 (C 'I I c' . G , , . ' · · • v , "' • 0111p1 llf t•om Rwhnnlson ) eo111ys (1h.mw~nys) bulbivorus, Gum., Saug. t sr,fi, fi30. (Compilo<l from RichaniMOII ) · Tlw111omys bulbwot·us, BAIIlD, M. N. A. 1857 3R9 pi GO r 3 c1 1 , · C n · · 1 1 ' 1 ' a-g, ILO p • 52, f. 1 a-g. (ltlOHtifios tho ~oA~~~~oup ~~~ ~rnum tmtnJ~I wit~ ~his species of Riollnrdson's, aud wiuutely describes it.)p R n' R. . . Rr_p. x, l~0>9, Wllha.rosou's Ronto, Mnmm. 82. ('l'ojon, Cn.l.)-KKNNEJtLY · · · ep. x, 1859 Wlupplo'11 Route Mu.mm 1'l 1 11 (C · ' Brit Mua 186n · .,. "• 223 . ' (C a 1.r . ) ' • ·' P · • u.hforni tl.)-GERR., Cat. Bones t•ornu~. Oryctomys (Sacoophoru-8. ) bollro, EYn. & Otmv., Mt~g. do z 1 F ~oo . vi, 1836, 23, pl. 21, f. 4 (to·'t'·) ,· Voy. 'IWOrito, V1 18:1!), 2:1, pl. 8, f. 4 (BtLIIIC). ., u OOUES ON GEOMYS AND THOMOMYS-T. BULBIVORUS. 259 Thomomys boltaJ, LJ£88., Nouv. Man. R. Aniw. 1842, 119. (Compilrd.}-BAmo, Proo. Acncl. Nat. Sci. Philo.. 1855, :J:Jo. (Subsequently idcntiliccl tho s•~•un wit,h bulbivoms.) Geomys fuliginosus, SCII INZ, Syn. Mamm. ii, 1 45, 1:.16. ( Uu11od on douglasi; numo altered for no good ranson.) 1'/tonwmyslatioeps, DAIHD, Proo. Acnd. Nat. Sci. Philn. 1~5, :3:35; M. N. A. 1857,392. (Humholdt Bny.)KJ£ NN., P. R. R. Rep. x, 1~9, Whipple's Route, Mamm. 13, pl. 12, f. 1 (by error marked "211 in text). (St~me us the foregoing.) Geom,ys dougliUlii, Rtcu., F. B. A. I, 18'~9, 200, pl. 1!:! C, ff. 1-6 (skull}; Zool. Voy. Blossom, 1839, 9. (Near mouth of Columbia.; Fort Vnnoouver.)- LECONTE, Pr()c. Acnd. Nat. Sci. Philn. 18.'12, 162. (Compiled from Richardson.) Geomys dottglasi, DxKAY, N.Y. l!' n. 1842, 92. (Compiled from Richurd110n.) Ascomys douglasii, WAON., Snppl. Schreb. iii, 1843, 392. (Compiled.) PscudoBtoma douglasli, Auo. & Baon., Q. N. A. iii, 18.'>:3, 24, pl. 105 (altogether too brightly colored). (Muinly compilocl from Richardson.) Geo11t!JB (Tltomomys) douglasi, GtEDEL, Saug. 1850, 631. (Compiled.) Thomomys dougla~~sii, BAmo, M. N. A. 18:;7, 394. (Minute description of specimens from Wushington and Oregon Territories.)-SuoKL., P.R. R.. R ep. xii, 1860, pt. ii, pp. JOO~ 126. DIAGNOSls.-Coloration heavier than in the foregoing; general cast reddish-brown, lined with dusky on the back; the head usually darl{er than the rest of the upper parts; on the sides, the color giving way to a c1earer tawny-brown, which occupies the belly also, there overlying the plumbeous roots of the fur as n strong wush. 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 whiti. h, 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 Washington Territory to Southern California. Description (from San Francisco specimens).-Ilaving already sufficiently insisted upon the fact that there is no decided difference in size or hape 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 brunch 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 dcn.l in different specimens, but is uever like the clear mousegray seen in talpoides. It is in reality an intimate mixture of yellowish-brown and darl{-brown or blackish. Above, the pointing of the fur conceal8 the plumbeous bases of the hairs; below, this plumbeous show~, overlaid with a |