224 THOMOMYS. 



Genl. Cliar. Size medium; tail less than one-half the length of 

 body and head; hands small, claws slender. 



Color. Above chestnut brown to dark cinnamon, lined with 

 black; beneath pale reddish brown; base of hairs lead color. Black 

 spot behind ear; about the mouth, chin, and inner margin of pouches 

 dusky; inside of pouches white. Feet grayish white. Tail, basal 

 half like back on upper part, rest grayish white. 



Measurements. Total length, 231 ; tail vertebra;, 72; hind foot, 30; 

 ear, 9.5. 



a. — pallescens. {Thomomys), Rhoads, Proc. Acad. Nat. Scien. Phil. 

 1895, p. 36. 



Type locality. Grapelands, San Bernardino Valley, California. 



Geogr. Distr. Southern California. 



Genl. Char. Size large; claws short, thick; feet medium. 



Color. Above tawny brown, lightest on rump; head blackish; 

 ear and auricular patch sooty; under parts tawny ash; feet and lower 

 surface of limbs ash. 



Measurements. Total length, 260; tail vertebrae, 89; hind foot, 35.5. 



334. iaticeps. {Thomomys), Baird, Proc. Acad. Nat. Scien. Phil., 



1855. P- 335- 



Type locality. Humboldt Bay, California. 



Geogr. Distr. Northern California. 



Genl. Char. Size small; tail nearly half as long as body and 

 head; skull broad; rostrum short; groove on upper incisors distinct; 

 claws on fore feet slender. 



Color. Above yellow reddish brown lined with black on back; 

 beneath tinged with reddish; throat, margin of pouches and spot 

 behind ears dusky; chin and inside of pouches white. Tail, above 

 dusky, beneath grayish white, feet grayish white. 



Measurements. Total length, 197; tail vertebrae, 63; hind foot, 28. 



335. townsendi. {Geomys), Richards, Bach. Journ. Acad. Nat. Scien. 



Phil., 1839, p. 105. 



borealis, Bach, (nee Rich.), Journ. Acad. Nat. Scien. Phil., 1839, 

 p. 103 (Columbia River). 



Type locality. " Rocky Mountains," Wyoming. 



Geogr. Distr. Southwestern Wyoming. 



Genl. Char. Colors pale, size medium; tail over one-third the 

 length of head and body. 



Color. Above pale yellowish brown, beneath white; a small 

 patch on breast white to roots, otherwise the bases are plumbeous. 

 Inside of pouches whitish. 



Measurements. Total length, 148; tail vertebrae, 42; hind foot, 24. 



