JTetr Sp&.'ie-s of Thoinoinys. 115 



Color. Upperparts (including tail) bright ochraceous, varying from 

 buffy fulvous to bright orange fulvous: dark nose patch usually reach 

 ing up to bet ween eyes and often to between ears: underparts varying 

 from buify to salmon fulvous: chin usually dusky; feet whitish; ear- 

 patch dark. 



Cranial characters. Skull very small, much smaller than fulvus; zygo 

 mata strongly bowed outward the anterior angle marked; interparietal 

 subquadrate, broader than long: nasals notched at hinder end, not 

 reaching near ends of premaxilhe: bulla? large and swollen. 



Thomomys pygmaeus sp. nov. 



Type fromMontpelier Creek, Idaho (alt. (5700 ft,). No. 55.271. $ ad., 

 U. S. National Museum. Biological Survey Collection. July 29, 1893. 

 Yernon Bailey. Original No. 4150. 



Characters. Si/e smallest of the known species; feet very small: color 

 dark: skull sub-cylindrical. 



Color. - Upperparts dark rufus brown: underparts buffy fulvous, the 

 dark underfur showing through: nose dusky: feet whitish. 



Cranial character*. Skull similar in general to that of idahoensis but 

 much smaller: braincase more cylindrical: interparietal larger and 

 transversely oval; nasals short, rather broad and emarginate at posterior 

 <Mid: bulla- strikingly smaller: teeth large relatively larger than in 

 idahoenMN. 



Mt**uremen1rType specimen ( $ ad.): total length 177: tail verte 

 bra- 4(5: hind foot 22. Another male from type locality: UHal length 

 105: tail vertebra- 40; hind foot 20. 



Thomomys douglasi oregonus subsp. nov. 



Type from Oregon City, Willamette Valley. Oregon. No. 5(>.939, $ 

 ad., U. S. National Museum, Biological Survey Collection. October 24. 

 1893. C. P. Streator. Original No. 3340. 



Characters. Externally like, dovglasi, but usually lacking the white 

 spot on breast. 



Cranial characters. Compared with douglasi the zygomata are larger 

 and much more broadly bowed outward and rounded, the outer sides parallel 

 instead of diverging anteriorly; nasals narrower posteriorly but sides 

 straight as in douglasi; interparietal decidedly larger and longer antero- 

 posteriorly, subtriangular instead of transversely oval, with posterior 

 margin straight and not encroaching on supraoccipital; bullre more 

 swollen; pterygoid notch Y-shaped instead of U-shaped. 



Measurements. Type specimen ( $ ad.): total length 220; tail vertebrae 

 70; hind foot 30. Average of 10 adults from type locality: total length 

 213; tail vertebra 66.5; hind foot 29, 



