THOMOMYS. 337 



TROUBLESOME POCKET GOPHER. 



Type locality. San Tomas, Lower California, Mexico. 



Genl. Char. About the size of T. f virus, but darker and grayer. 

 Nasals short, broad anteriorly; pterygoid almost touching the bullae. 



Color. (March.) Upper parts mixed broccoli brown and ochra- 

 ceous, the slate at base of hairs showing through occasionally and 

 giving a grayish tint to the pelage; sides bright ochraceous buff; 

 spot behind ear, nose and openings of pouches black; under parts 

 ochraceous buff, plumbeous of under fur showing through; hands 

 and feet grayish white; tail ochraceous buff above, yellowish beneath. 

 Another specimen in July from San Quentin is lavender gray, darkest 

 on dorsal region, with top of head ochraceous buff and black, and 

 sides of head pinkish buff. This individual is beginning to change 

 to the darker pelage of winter. 



Measurements. Total length, 222; tail vertebrae, 69; hind foot, 

 29; ear, 7.5. Skull: occipito-nasal length, 38; Hensel, 35; interorbital 

 constriction, 6; zygomatic width, 25; length of nasals, 12.5; anterior 

 width of nasals, 4.5; palatal length, 23; length of upper molar series, 

 7.5; length of mandible, 22; length of lower molar series, 7; height 

 at coronoid process, 15. 



338. peregrinus (Thomomys), Merr., Proc. Biol. Soc. Wash., vin, 



1893, p. 146. 

 WANDERING POCKET GOPHER. 



Type locality. Salazar, State of Mexico, Mexico. 



Geogr. Distr. State of Mexico. Range unknown. 



Genl. Char. Similar to T. fulrtis, but darker; incisors curving 

 forward; rostrum narrower than interorbital width. 



Color. Above dark umber brown; sooty black on head and on 

 median line; sides dull fulvous; under parts buffy; end of nose, 

 around mouth and ear patch blackish; fore feet umber brown to 

 base of toes; hind feet plumbeous (under fur showing through). 



Measurements. Total length, 207; tail vertebrae, 72; hind foot, 

 28.5. 



339. orizaba (Thomomys), Merr., Proc. Biol. Soc. Wash., vin, 1893, 



P- i45- 

 ORIZABA POCKET GOPHER. 



Type locality. Mt. Orizaba, State of Puebla, Mexico. Altitude, 

 9,500 feet. 



Geogr. Distr. State of Puebla, Mexico. Range unknown. 



Genl. Char. Size medium; color similar to that of T. fulvus; tail 

 long; feet well haired; muzzle of skull longer and broader than in 

 T. peregrinus, and broader than interorbital width. 



