H&errictm ^Yeir Spades of Tlioniounjs. 113 



Character*. Sixe medium; coloration dark: nose, chin and region 

 around mouth blackish: em-patch black; fore fee! and legs dark. Skull 

 long: nasals short. 



Color. Upperparts dull grayish brown with a dull fulvous suffusion 

 and 'pepper and salt' appearance from profuse admixture of black 

 tipped hairs: cheeks and sides of neck grixxled bister: sides grayish or 

 grayish brown: nose, earpatch, and throat dusky; fore legs and feet 

 grayish dusky with a little white at base of toes: hind feet whitish; tail 

 mainly dark above. 



Cranial I'tianiHerx. Skull rather small but larger than that of fuxcux; 

 xygomata moderately spreading: broadest behind: nasals *h<>rt, falling 

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

 terparietal large, pentagonal or between subquadrate and pentagonal; 

 temporal impressions nearly parallel but not forming ridges as in tal- 

 poidr.* and bridacri; auditory tubes conspicuous: bill la 1 and teeth rather 

 large. 



ttcinarkx. This species is so distinct that close comparison with others 

 is unnecessary. The skull may be told at a glance by the very short 

 nasals and relatively long premaxillae in connection with the size and 

 shape of the interparietal. 



Measurements. Type specimen: total length 220; tail vertebra? 68; hind 

 foot 30. Average of 2 males from type locality: total length 226; tail 

 vertebra? 70.5; hind foot 31. An adult female from type locality: total 

 length 211; tail vertebra? 64; hind foot 28. 



Thomomys bridgeri sp. nov. 



Type from Fort Bridger, Wyoming. No. f|ff|, $ ad., U. S. National 

 Museum. Biological Survey Collection. May 27, 1890. Yernon Bailey. 

 Original No. 1207. 



Characters. Rather large. Size and proportions as in ialpoides but 

 ears having a distinct point posteriorly: coloration dark (similar lo'fua- 

 nix, darker and redder than talpoides); differs from both talpoides ami fu sens 

 in having chin and openings of cheek pouches black instead of white. 



Color. Upperparts usually pale dull chestnut brown, sometimes al 

 most buffy brown, and always well mixed with black hairs; underpaid s 

 strongly washed with buffy fulvous; nose, earpatch, chin, and openings 

 of cheek pouches dusky; feet Avhitish. 



Cranial characters. Skull rather large, with marked parallel temporal 

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

 squarish spreading xygomata. 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. uinta, 

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

 nasals, broadly spreading xygomata, smaller and differently shaped in 

 terparietal, much more strongly developed temporal ridges, and de 

 cidedly larger size, 



