230 THOMOMYS. 



Color. Above pale brownish yellow, sides yellowish white, 

 beneath white; feet white. Tail, white for two-thirds the length, 

 tip blackish. 



Measurements. Total length, 228; tail vertebrae, 76; hind foot, 52. 



349. cervinus. {Thonwinys), Allen, Bull. Amer. Mus. Nat. Hist., 



1895, p. 203, fig. I. 



Type locality. Phoenix, Arizona. 



Geogr. Dtstr. Southern Arizona. 



Genl. Char. Size large; color pale; rostrum broad, heavy; skull 

 large. 



Color. Above fawn, obscured on dorsal region with dusky; 

 beneath gray, base of hair plumbeous; blackish area about ears; 

 pouches inside white; feet whitish; tail above grayish fawn, paler 

 beneath. 



Measiireiiients. Total length, 228;tail vertebrae, 63; hind foot, 28. 



350. altivalis. {Tliomomys), Rhoads, Proc. Acad. Nat. Scien. Phil.. 



1895, p. 34. 



Type locality. San Bernardino Mountains, California. 



Geogr. Distr. Mountains of southeastern California. 



Genl. Char. Size medium, larger than J/. ///('///zVc/a. Skull long 

 and narrow; rostrum long and wide, nasals long; incisors wide and 

 strong, molars massive; coronoid process of mandible erect, acutely 

 pointed. 



Color. Above dull chestnut brown, darker on dorsal region, 

 median line nearly black; aural patch large, dusky reaching nearly to 

 occiput; beneath plumbeous gray, washed with rusty; feet and legs 

 like under parts; tail grayish. 



Measurements. Total length, 228; tail vertebras, 74; hind foot, 

 29. Skull: total length, 39.7; basilar length, 34; zygomatic width, 

 23.2; interorbital constriction, 7, nasals, 13. 



351. fossor. {Thomomys), Allen, Bull. Am. Mus. Nat. Hist. 1893, p. 51. 

 Type locality. Florida, LaPlata County, Colorado. 



Geogr. Distr. Upper San Juan region, Colorado. 



Genl. Char. "Size large; claws large; interparietal convex 

 anteriorly; nasals terminating posteriorly on a line with the maxil- 

 laries." 



Color. Above dusky brown tinged with gray ; dorsal region 

 washed with dark chocolate brown; sides graj-er; beneath grayish 

 plumbeous, hairs tipped with pale buff, sometimes with whitish; chin 

 and center of throat white; aural area black; feet whitish; tail basal 

 two-thirds blackish, rest white. 



Measurements. Total length, 293; tail vertebrae, 64; hind foot, 30. 



