THOMOMYS. 223 



lower jaw, lining of pouches and anal spot white; spot on either side 

 of mouth liver brown, beneath brownish gray. 



Measurements. Total length, 357; tail vertebrae, 63. 



330. nevadensis. {T/ionwm\s), Merr., Proc. Biol. Soc. Wash., 1897, 



p. 213. 



Type locality. Austin, Nevada. 



Geogr. Distr. Nevada, limits of range unknown. 



Genl. Char. Size large; two color phases, pale buff and plum- 

 beous slate; incisors curving forward; tail more than half the length of 

 body and head. 



Color. Normal Pelage. Above buffy gray, darkest on nose and 

 mouth; beneath whitish buff, base of fur plumbeous; feet and tail 

 whitish, aural space dusky. 



Plumbeous Pelage. Above and beneath slate color, patch on 

 throat and inside of pouches, feet and apical portion of tail white. 



Measurements. Total length, 275; tail vertebra", 90; hind foot, 38. 



331. leucodon. [Tliomomys), Merr., Proc. Biol. Soc. Wash., 1897, 



p. 215. 



Type locality. Grant Pass, Rogue River Valley, Oregon. 



Geogr. Distr. Oregon, limits not determined. 



Genl. Char. Similar to 7'. laticcps, smaller; incisors white; teeth 

 small; brain case broad, temporal ridges parallel; skull similar to that 

 of T. laticcps., but smaller. 



Color. Above dull fulvous brown; brighter on sides and under 

 parts; nose, sides of mouth and aural patch dusky; feet whitish; tail 

 yellowish buff. 



Measurements. Total length, 221 ; tail vertebrae, 68; hind foot, 29. 



332. operarius. {Thomomys), Merr., Proc. Biol. Soc. Wash., 1897, 



p. 215. 



Type locality. Keeler, Owens Lake, Inyo County, California. 



Geogr. Distr. Eastern California. 



Genl. Char. Size small; color pale; claws long, slender; skull 

 short, broad; rostrum short and broad; interorbital regions broad. 



Color. Above buff gray; beneath plumbeous washed with white; 

 feet and tail white. 



Measurements. Total length, 228; tail vertebrae, 67; hind foot, 30. 



3ii- bottae. (Oryefomvs), Eyd. & Gerv., Mag. Zool., 1836, p. 23, pi. 



xxl, fig. 4 (teeth). 

 huldivorus, Baird (nee Richards), N. Am. Manim., 1857, p. 389, 



pi. 50, fig. 1-9. 

 Type locality. Monterey, California. 

 Geogr. Distr. Central and southern California. 



