112 Merriam — Nen' /^j)ecies of TJiowomys. 



mala more squarely spread iiiir: premaxillfe shorter and broader poste- 

 riorly; bulhe less swollen; incisors narrower. 



MeasuremenU. — Type specimen {$ ad.): total length 11)1; tail verte- 

 bras 62; hind foot "M. Average of G specimens from ty[)e locality: total 

 length 192; tail vertebr;e oS: hind foot 2.i. 



'^e' 



Thomomys myops sp. nov. 



Type from C'onconvilly. east base Cascade Range, State of Washington. 

 No. 91,000. 9 ad., U. S. National Musenm, Biological Snrvey Collec- 

 tion. September 11, 1897. .1. Alden Loring. Original No. 40.50. 



Characters. — Size small; color and external characters generally as in 

 T.fuscns; skull peculiar. 



Color. — l^pperi)arts dull pale rufous brown: underparts buffy oelira- 

 ceous, the dark slate underfur showing through: throat, chin, and feet 

 whitish: nose, sides of mouth, ring round eye, and earpatch dull plum- 

 beous, the earpatch darkest. 



Cranial chararttrx. — Skull in general similar to that of f/iiadrafiix. but 

 zygomata less quadrate and posterior root shorter: nasals broader, trun- 

 cate posteriorly, and ending on same plane as premaxillfp, which are 

 remarkably short and truncate posteriorly; bulhe about as in (/u<i(Jr(/tux 

 — less swollen than in fii.srn.-<: under jaw rather massive, about as in 

 quadratus — decidedly heavier than \nfHscii.\. 



Measiirciiicutx. — Type specimen ( 9 nd.): total length 197: tail verte- 

 l)r?p Oo: hind foot 2(5. Average of 7 specimens from type locality: total 

 length 184: tail vertebra^ 58: hind foot 24.."). 



Thomomys leucodon navu5 subsp. nov. 



Type from Red Bluff, California. No. .57.791, $ ad.. U. S. National 

 Museum, l^iological Survey Collection. December 20. 189;}. C. P. 

 Streator. Original No. 3402. 



Chararttirs. — ^imW&v io leucofloit but much smaller; incisors projecting 

 forward, their faces yellow instead of white; upperparts paler and 

 brighter fulvous: underparts buffy ochraceous instead of fulvous. 



Cranial rharacterx. — Skull small but very strong and ivory-like in text- 

 ure; zygomata broadly spreading, broadest posteriorly; nasals cuneate, 

 usually notched behind. 



Mcaftnrcmentti. — Type specimen ( $ ad.): total length 200; tail verte- 

 bra* 07; hind foot 27. Average of 8 specimens from type locality: total 

 length 196; tail vertebrae 65; hind foot 27. 



Thomomys uinta sp. nov. 



Type from Uinta Mountains, Utah. Altitude 10,000 feet. No. HMt- 

 $ ad., U. S. National Museum, Biological Survey Collection. .Tune 6, 

 1890. Vernon Bailey. Original No. 1262. 



