1915.] 



THOMOMYS I^ULVUS GROUP. 



85 



Santa Catalina Mountains, slightly larger and darker. Variation in 

 size corresponds somewhat with the extent of high mountain areas 

 which the animals inhabit, the smallest specimens being from the 

 very restricted summit of the Animas Mountains. The difference 

 between those from the tops of the Animas and the Huachuca 

 Mountains is slight, however, compared with that between specimens 

 of intermedius from the summit and toltecus from the base of either 

 range. 



Specimens examined. — Total number, 63, as follows: 

 Arizona: Chiricahua Mountains, 22; Fly Park (at 9,000 feet altitude), 1; Graham 

 Mountains (8,500 to 9,200 feet), 8; head of Rucker Canyon, 2; Huachuca 

 Mountains (up to 9,000 feet), 19; Mount Graham, 3; Santa Catalina Moun- 

 tains (8,000 feet), 6. 

 New Mexico: Animas Mountains (7,000 feet), 2. 



THOMOMYS FULVUS TEXENSIS Bailey. 

 Davis Mountain Pocket Gopher. 



(PI. IV, fig. 4.) 



Thomomys fulvus texensis Bailey, Proc. Biol. Soc. Washington, XV, 119, 1902. 



Type. — Collected on Davis Mountains, Texas (head of Limpia Creek, 

 at 5,500 feet altitude, in edge of Transition Zone), by Vernon Bailey, 

 January 7, 1890. Type specimen in U. S. Nat. Mus., Biological 

 Survey collection. 



Distrihution. — Known only from type locality (fig. 7). 



Ckaracters. — Similar to fulvus ^ but smaller; hind foot 24-27 mm.; 

 skull relatively narrower; color slightly lighter; mammae in 4 pairs. 



Color. — Summer pelage: Upperparts tawny-gray; underparts brighter 

 clearer tawny; ear patch, nose, and cheeks blackish; feet and lips 

 gray; lining of pouches white. Winter pelage: Slightly duller and 

 darker than in summer. 



SJcull. — Light and slender, distinguished from that of fulvus by 

 high narrow braincase, shallower lateral pits of palate, and shorter 

 pterygoids. 



Measurements. — Type (d'ad.): Total length, 204; tail vertebra, 

 63; hind foot, 26. Average of 5 topotypes (d^ad.): 203, 65, 26.6. 

 Average of 5 females: 187, 61, 25.8. Slcull (of type): Basal length, 

 34.5; nasals, 13; zygomatic breadth, 22; mastoid breadth, 18; 

 alveolar length of upper molar series, 7. 



Remarlcs. — This is evidently a small local race of fulvus, a.s shown 

 by similarity of skull characters and also by color and general char- 

 acters. It is evidently isolated in the Transition Zone area of the 

 Davis Mountains, but not widely separated from more nearly typical 

 fulvus of the Guadalupe Mountains. 



Specimens examined. — Twenty, from type locality. 



