GEOMYIOvE— TIIOMOMYH TALl'OIDES. 



f.ooty-l)Inckis!i llierc. The Pacific Coast race \s a rich ilnrk-l)rowri uniinal, 

 mu(l(ly-i)cllie<1, with dusky tail and foot, wholly or in part, nnd souty nliuiit 

 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; ond, in every respect of 

 color, all the races show much variation, and, moreover, intcrgmdc completely. 

 The various forms under which the genus Thomomys is exhibited may 

 bo discriminated by the following characters: — 



ANALYSIS OF SPECIES AND VASIETIE8. 



A. I^rgo. Hiud foot an Inch nr mora long. Tall st least one-tbird m long tm liewl 



and body. Above brown, reddinb, &o. Btdow gray, brown, reddlab, lie. (nut 



wbitv)' Earn In a blockUh area well developed 1. talpoipks. 



«. Six to rifjbt incbea long; fore clawn highly developed (0.45 to 0.S3 long), making 

 the liand about as long as the foot. Color of the house-rat, with white tail and 

 feet, and nsunlly white abont the month and throat; no oontrasts of dark color 

 about the montb. (Kortbem Interior) a. (a/jwidra. 



h. 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, oontraating with 

 white of the ponob-liniog. (PociAo Coast) b. t«/6hx>nu. 



e. Snisller on an average i usually six to seven inches long. Fore claws abont 0.40 

 or less, leaving the hand decidedly shorter than the foot. Rich fulvons, or even 

 fawn-color, the same lieiow bnt paler, variously obscured on the Iwck with 

 dusky; tail and feet usually dark; face and month-parts aooty-blaokish.sbarply 

 contrasting with white pouch-lining. (Soathem Interior and Lower Cali- 

 fornia) e. asitriaas. 



B. Small ; decidedly less tbac six inches loug. Hind foot about 0.75 ; fore foot still 



less. Tail scarcely one-fonrth as long as the bead and body. Above, pallid 

 yellowish-gray, with a shade of light brown ; below, entirely white ; feet and 

 tail white. Ears minute, not in a blockish area. Nose blackish. (Bridger's 

 Paaa, Rooky Mountains) it. CLuaivit. 



THOMOMYS TALPOIDES, (Rich.) Baird.* 

 Mortbern Pocket Gopher 



Orieetiu latpoUe$, Bicn., Zool. Joum. ill. No. 19, Jan.-Apr. 1828, 518. (Plambago-oolored.) 

 atomfi lalpoidn, Rich., V. B.A. i, 18it9, 804 ; Rep. Brit. Assoc, for 183A, vi, 1S»7, ISO, 156. (Same astbe pre- 

 ceding, bnt " Florida " assigned wrongly as a locality.)— DrKav, N. Y. Fn. 184it, Vi. (Com- 

 piled (Voni Richardson.)— SciliNZ, Synop. Hamm. ti, 1645, 137. (Compiled from Rich- 

 ardson.)— LkContk, Proc. Acad. Nat Sci. Pbila. vi, 185S, 163. (Compiled from Richardson.) 

 Saenglianii lalpoUm, Fihcii., Synop. Homm. 1830, 588 (marked •' 388 "). (Compiled from Richardson.) 

 .4«»i»y< lalpoida, Waon., Suppl. Schreb. iii, 1843, 390. (Compiled from Richardson.) 

 i>M«dM(0iia lalpoida, AuD. &. Dacr., Q. N. A. iii, 1853, 43, pi. 110. (Compiled from Richardson ; Bgnro 



from t^e type-specimen,) 

 Cnmys (Tkoaiosiyt) lalpM<<»,OnBKL, Siing. 1855, 630. (Compiled fknm Richardson.) 

 Tliomomf$ lalpoUf, Daiiid, U. N. A. 1857, 403. (Compiled from Richardson.)— CouK8, Proo. Pbl!a. Acad. 

 1875, 135.— CoDU, Powell's Rep. Colorado It. 1875, iffiO (monographic ; Dicbardson's species 

 identified, de«eril>ed, and disonssed). 



*8peoi*l paper: "Short cbaracten of a few Qnadrnpeds pr^urod.on Capt. Franklin's lata Expe- 

 dition." < The Zoological Jonmal, iii, Mo. 18, jBn.-Apr. 1838, pp. 516-500. 



