3/ern'(/)// — N^ew /^j)cri('i^ of ThDiiioiinjx. 1J3 



('Iiiiriiiiirs. — Size medium: coloral ion darl-;; nose, cliin and I'e.irion 

 around moulli blackish: earpalcii l)iaci\: fore feet and legs dark. Skull 

 lon^; nasals short. 



(■(dor. — Upperparls dull grayish l)ro\vii with a dull fulvous suffusion 

 and 'pepper and salt" appearance from profu.se admi.xture of black 

 tipped hairs; cheeks and sides of neclv ;u^rizzled bister: sides grayisii or 

 grayish brown: nose, earpatch. and throat dusky; fore le<is and feel 

 g'rayish duslvy with a little white at base of toes: hind feet whitisli: tail 

 mainly dark above. 



CfiiiilnJ rhanicti'VK. — Skull ral her small but lar.y'er than that o^ fiiKnis; 

 zygomata moderately spreading: broadest behind: nasals xJinrf. falling 

 far short of premaxilhe, and moderately or faintly notched beliind: in- 

 terparietal large, pentagonal or between subipiadrate and pentagonal: 

 li'inporal impressions nearly parallel liut nol forming ridges as in tal- 

 poidc.s n\\i\ /iridf/m': auditory t ul)es conspicuous: tiulhe and leclh rather 

 large. 



Re))it(rk)<. — This species is so distinct that close comparison with others 

 is unnecessai'v. The skull may be told at a glance by the \'ery short 

 nasals and relatively long prema.xillic in connection with the size and 

 shape of the interparietal. 



Measurementii. — Type specimen: total Icngl h 'J'id: lail \ crlebi-jr (iS; hind 

 fool lid. .\\'erag(' of 2 males from t>pe locality: total lengtli 2:2(): tail 

 vertebne ro.."); hind fool ol. An adult female from type locality: total 

 length 211: tail \erlebra' (54; hind foot 28. 



Thomomys bridgeri si), nov. 



Type from Fort IJridger, Wyoming. No. H^^2» S '"I' ' • ^- National 

 Museum, Biological Survey ('oiled ion. May 27. 18!*0. N'ernon llailey. 

 Original No. 1207. 



ClKiraders. — Rather large. Size and proportions as in ti(l/)(ii(Jes but 

 ears having a distinct point posteriorly; coloration dark (similar to_/V.s- 

 rKx, darker and redder ihun talpoides); ili Iters frf)m both ((iJjioides a.ndfuscvs 

 in having chin and openings of cheek pouches Itluc/c instead of white. 



Co/or. — Upperparts usually pale dull chestnut brown, sometimes al- 

 most buffy brown, and always well mi.x;ed with black hairs; underparts 

 strongly washed with buffy fulvous: nose, earpatch. chin, and openings 

 of cheek pouches dusky: feet whitish. 



Cranial characters. — Skull rather large, with nuirked parallel lemi)oral 

 ridges, long rostrum and nasals (nasals deeply notched behind and 

 squarish- spreading zygomata. Similar in general to talpoides, but- ros- 

 trum and nasals much longer: nasals deeply notched behind: auditory 

 tube strongly ossified and widely protruding. Compared with T. vinta^ 

 whose range it joins, it differs strikingly in the great length of the 

 nasals, broadly spreading zygomata, smaller and differently shaped in- 

 terparietal, much more strongly developed temporal ridges, and de- 

 Qidedly larger size. 



