THOMOMYS. 337 
TROUBLESOME POCKET GOPHER. 
Type locality. San Tomas, Lower California, Mexico. 
Genl. Char. About the size of T. fulvus, but darker and grayer. 
Nasals short, broad anteriorly; pterygoid almost touching the bulle. 
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., vim, 
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. fulvus, 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 vertebre, 72; hind foot, 
2355. 
339. orizabe (Thomomys), Merr., Proc. Biol. Soc. Wash., vii, 1893, 
Ps TAR. 
OrizaABA 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. 
