THOMOMYS. 87 



underparts mixed black and buff. Ex type in United States National 

 Museum. 



Measurements. Total length, 250; tail, 85; hind foot, 34. Skull: 

 Total length, 42.7; zygomatic width, 28; intertemporal width, 7.1; 

 length of nasals, 14; mastoid breadth, 23; palatal length, 7; length of 

 upper molar series, 8.5; length of mandible, 28.8; length of lower 

 molar series, 7.9. Ex type in United States National Museum. 



Thomomys canus Bailey. 



Thomomys canus Bailey, Proc. Biol. Soc. Wash., XXIII, 1910, 

 p. 79. 



Type locality. Deep Hole at north end of Smoke Creek Desert, 

 Washoe County, Nevada. 



GenL Char. Larger than T. aureus; colors pale, 



Color. Ear-patch dusky; nose brownish, upperparts pale buff- 

 gray; underparts, tail, hands and feet whitish. Ex type in United 

 States National Museum. 



Measurements. Total length, 242; tail, 64; hind foot, 33. Skull: 

 Occipito -nasal length, 37.8; Hensel, 35.2; intertemporal width, 6.1; 

 zygomatic width, 28; length of nasals, 15; mastoid breadth, 23; 

 palatal length, 6.3; length of upper molar series, 9; length of mandible, 

 24.9; length of lower molar series, 7.1. Ex type in United States 

 National Museum. 



Thomomys chrysonotus Grinnell. 



Thomomys chrysonotus Grinnell, Univ. Calif. Publ. Zool., X, 1912, 



p. 174. 

 Type locality. Ehrenberg, Yuma County, Arizona. 



Thomomys magdalenae Nelson and Goldman. 



Thomomys magdalena Nels. and Goldm., Proc. Biol. Soc. Wash., 

 XXII, 1909, p. 24. 



Type locality. Magdalena' Island, Lower California, Mexico. 



Genl. Char. Nearest to T. b. anitce but paler; skull larger. 



Color. Upperparts pale buffy, tinged with ochraceous; lips and 

 underparts creamy white; hands, feet and tail sparsely covered with 

 white hairs. Ex type in United States National Museum. 



Measurements. Total length, 255; tail, 87; hind foot, 36. Skull: 

 Total length, 43.2; Hensel, 38; zygomatic width, 29.1; intertemporal 

 width, 6 4; length of nasals, 15.2; palatal length, 7.9; length .of upper 

 molar series, 8.9; length of mandible, 26.1; length of lower molar 

 series, 9.6. Ex type in United States National Museum. 



