THOMOMYS. 85 



Genl. Char. About equal to T. clusius. Skull with wider inter- 

 parietal, and smaller bullse; color darker. 



Color. Ear-patch blackish; nose plumbeous; upperparts dull 

 grayish brown; chin white; underparts buffy; tail gray, tip whitish; 

 hands and feet white. Type in United States National Museum. 



Measurements. Total length, 196; tail, 54; foot, 26. 



Thomomys talpoides nebulosus Bailey. 



Thomomys talpoides nebulosus Bailey, Proc. Biol. Soc. Wash., 

 XXVII, 1914, p. 116. 



Type locality. Sand Creek Canon, Black Hills, Wyoming. Alti- 

 tude, 3750 feet. 



Genl. Char. Size equal to T. talpoides. Skull slender, dentition 

 lighter. 



Color. Blackish ear-patch; nose dusky; upperparts dull walnut- 

 brown; underparts buffy; chin white; tail, hands and feet whitish 

 gray. Type in United States National Museum. 



Measurements. Total length, 230; tail, 66; foot, 32. 



Thomomys pryori Bailey. 



Thomomys pryori Bailey, Proc. Biol. Soc. Wash., XXVII, 1914, 

 p. 116. 



Type locality. Head of Sage Creek, Pryor Mountains, Montana. 

 Altitude 6000 feet. 



Genl. Char. Equal to T. clusius. Skull wide, nasals short, incisors 

 projecting. 



Color. Upperparts dull walnut-brown; nose plumbeous; cheeks 

 dark gray; ear-patch black; underparts dark buff; tail, hands and 

 feet buffy. Type in United States National Museum. 



Measurements. Total length, 210; tail, 60; foot, 29. 



Thomomys bottae russeolus Nelson and Goldman. 



Thomomys botta russeolus Nels. and Goldm., Proc. Biol. Soc. Wash., 

 XXII, 1909, p. 25. 



Type locality. San Angel, 30 miles west of San Ignacio, Lower 

 California, Mexico. 



Genl. Char. Color pale. Skull small, light; bullae rounded. 



Color. Upperparts ochraceous buffy; underparts creamy white; 

 belly sometimes pale buff; hands, feet and tail covered sparsely with 

 white hairs. Ex type in United States National Museum. 



Measurements. Total length, 208; tail, 73; foot, 29.5, Skull: 

 Occipito-nasal length, 36.6; Hensel, 33.3; zygomatic width broken; 

 intertemporal width, 6.2; length of nasals, 13; palatal length, 6.3; 



