Bailey New Mammals from Western Texas. 119 



Skull. Comparatively long, with short, wide nasals, rounded at pos 

 terior ends; incisors dark orange instead of light yellow; middle upper 

 molar with projecting inner point at base of posterior triangle as in 

 mogo llonensis. 



Measurements. Type: total length 152; tail 34; hind foot 20. Aver 

 age of 9 adults: 144; 34; 19. Skull of type: basal length 24.5; nasals 

 7.5; zygomatic breadth 16; mastoid breadth 12.4; alveolar length of 

 upper molar series 7.2. 



Fiber zibethicus ripensis subsp. nov. 



Type from the Pecos River at Carlsbad (Eddy), New Mexico, No. 

 109,012, U. S. National Museum, Biological Survey Collection, $ ad. 

 Collected July 25, 1901, by Vernon Bailey. Original No. 7757. 



General characters. Size small; color paler than in zibethicus but 

 darker than in pattidus; skull narrow; incisors heavy. 



Color. Adults in July: Upperparts light brown without any distinct 

 black; belly buffy brown; throat gray, inclosing a sharp, dusky chin 

 stripe; a small spot over each nostril whitish. 



Skull. Small and narrow; nasals short and rounded or pointed at pos 

 terior end, never notched; incisive foramina widest at posterior end; 

 incisors heavy, molars light. 



Measurements. Type: total length 470; tail 202; hind foot 67. Aver 

 age of 6 adults: 463; 204; 68. Skull of type: basal length 55; nasals, 18; 

 zygomatic breadth 35; mastoid breadth 25; alveolar length of upper 

 molar series 15. 



Remarks. This form is distinguished from zibetMcus by paler color, 

 smaller size, heavier incisors, unnotched nasals, and form of incisive 

 foramina; from paUidus by darker color, narrower skull, form of nasals 

 and incisive foramina, and slightly heavier dentition. No other compar 

 isons are necessary. 



Thomomys fulvus texensis subsp. nov. 



Type from the head of Limpia Creek at 5,500 feet altitude in the 

 Davis Mts., Texas, No. 2251, U. S. National Museum, Biological Survey 

 Collection, $ ad. Collected January 7, 1890, by Vernon Bailey. 

 Original No. 876. 



General cJiaracters. Similar to Thomomys fulvus but smaller, less 

 dusky, and with narrower skull. 



Color. Upperparts dusky fulvous with blackish ear patch and nose ; 

 lowerparts plain bright fulvous; feet and lips gray; lining of pouches 

 white. 



Skull. Similar to that of fulvus but with conspicuously narrower 

 braincase, shallower lateral pits of palate, and shorter pterygoids. 



Measurements. Type: total length 204; tail 63; hind foot 26. Aver- 



