226 THOMOMYS. 



Color. Above russet fulvous; beneath plumbeous washed with 

 salmon fulvous; nose and aural spot dusky; feet and tail whitish. 



Measurements. Total length, 220; tail vertebra, 67; hind foot, 29. 



339. nasicus. (T/wmomys), Merr. , Proc. Biol. Soc. Wash., 1897, 



p. 216. 



Type locality. Farewell Bend, Des Chutes River, Oregon. 



Geogr. Distr. Oregon. 



Genl. Char. Similar to T. mazama, paler; skull long, slender; 

 nasals long; zygomata sloping backward; audital bulla; very small; 

 interparietal large, transversely lengthened. 



Color. Above pale russet fulvous; beneath plumbeous washed 

 with pale fulvous; usual aural spot; feet and tail whitish. 



Measurements. Total length, 214; tail vertebrae, 69; hind foot, 27. 



340. douglasi. (Geomys), Rich. Faun. Bor. Amer. , 1829, i, p. 200. 

 Type locality. Vicinity of Portland, Oregon. 



Geogr. Distr. Lower Columbia River, northward into British 

 Columbia. 



Genl. Char. Tail about one-third length of body and head, claws 

 large, stout. 



Color. Above reddish or chestnut brown; slightly mottled on 

 sides and under parts with ashy brown; throat, about cheek pouches 

 and between fore legs grayish ash; duskj' spot behind ear; edge of 

 lips and top of nose also dusk\'; feet grayish white; tail dusky above, 

 grayish white below. 



Measurements. Total length, 205; tail vertebra;, 50; hind foot, 25. 



a.—fuscus. {Thomomys), Merr., N. Am. Faun., No. 5, p. 69. 



Type locality. Head of Big Lost River, Idaho. 



Geogr. Distr. Mountains of Central Idaho. 



Genl. Char. Tail nearly half as long as body and head; colors 

 dark; size large. 



Color. Above chestnut; beneath plumbeous washed with fulvous; 

 black around ear; tail and feet whitish. 



Measurements. Total length, 215; tail vertebra?, 72; hind foot, 

 27; ear, 3. 



&. — yelmensis. (Thomomys), Merr., Proc. Biol. Soc. Wash., 1899, p.21. 



Type locality. Tenino, Yelm Prairie, southwestern Washington. 



Geogr. Distr. Washington, range not determined. 



Genl. Char. Similar to T. douglasi, paler; skull has larger inter- 

 parietals; frontals depressed interorbitally; angle of mandible forming 

 a hook; incisors broader, thicker. 



