84 THOMOMYS. 



Genus Thomomys (94). 

 Pocket Gophers. 



Thomomys albatus Grinnell. 



Thomomys albatus Grinnell, Univ. Calif. Pub. Zool., X, 1912, p. 172. 



Type locality. West side of Colorado River, at old Hanlon Ranch, 

 near Pilot Knob, Imperial County, California. 



Thomomys talpoides agrestis Merriam. 



Thomomys talpoides agrestis Merr., Proc. Biol. Soc. Wash., XXI, 

 1908, p. 144. 



Type locality. Medano Ranch, San Luis Valley, Colorado. 



Genl. Char. Like T. talpoides but color paler. Skull longer and 

 narrower; zygomata less wide; jugal part of zygomatic arch narrower. 



Color. Upperparts drab, sometimes the top of the head tinged 

 with pale red; dusky ear-spots; underparts whitish, plumbeous under 

 fur showing; tail above and beneath buffy; hands and feet white. 

 Ex type in United States National Museum. 



Measurements. Total length, 220; tail, 55; foot, 29. Skull: 

 Occipito-nasal length, 41.2; Hensel, 35.6; zygomatic width, 23.6; 

 intertemporal width, 6.7; length of nasals, 5.4; palatal length, 7.5; 

 length of upper molar series, 7.8; length of mandible, 24.5; length of 

 lower molar series, 8.2. Ex type in United States National Museum. 



Thomomys talpoides bullatus Bailey. 



Thomomys talpoides bullatus Bailey, Proc. Biol. Soc. Wash., XXVII, 

 1914, p. 115. 



Type locality. Powderville, Montana. 



Genl. Char. Equal in size to T. talpoides, but the audital bullae 

 larger; teeth lighter and color paler. 



Color. Crown bright buffy hazel, Upperparts lighter; underparts 

 buffy; ear-patch blackish; chin, hands, feet and tail white. In 

 some examples the white on chin is absent. Type in United States 

 National Museum. 



Measurements. Total length, 238; tail, 72; foot, 30. 



Thomomys talpoides caryi Bailey. 



Thomomys talpoides caryi Bailey, Proc. Biol. Soc. Wash., XXVII, 

 1914, p. 115. 



Type locality. Head of Trapper Creek, Bighorn Mountains, 

 Wyoming. Altitude 9500 feet. 



