336 THOMOMYS. 
Geogr. Distr. Lower California, Mexico, north into southern 
California. 
Genl. Char. Size large; claws short, thick; Skull massive, 
angular; dentition weak; interparietal longer than wide. 
Color. Above tawny brown; rump lighter; head blackish; ears 
and aural patch sooty; beneath tawny ash; feet and lower surface 
of limbs ash. 
Measurements. Total length, 260; tail vertebra, 89; hind foot, 
33.5. Skull: total length, 39; zygomatic breadth, 24.4; basilar 
length, 35.5; nasals, 11.9; interorbital constriction, 6.9; length of 
mandible, 25. 
d.—intermedius (Thomomys), Mearns, Proc. U.S. Nat. Mus., 1897, 
xix p. 719. Elhotysyn. N. Am. Mamm., 19qn,-p. 228. 
PLATEAU PocKET GOPHER. 
Type locality. Huachuca Mountains, southern Arizona. Alti- 
tude, 9,000 feet. 
Geogr. Distr. Mountains connecting Colorado Plateau with that 
of Mexico. 
Genl. Char. Smaller than 7. fulvus. 
Color. General hue mars brown; dorsal area plumbeous black; 
feet and tail soiled white; base of under fur plumbeous. 
Measurements. Total length, 220; tail vertebra, 66; hind foot, 
BA. axle, s2t-5 Kea. (Mearns, 1. c.) 
336 martirensis (7iomomys), Allen, Bull. Amer. Mus. Nat. Hist., 
1898, p. 147. 
San Pepro MArtTIR PocKET GOPHER. 
Type locality. San Pedro Martir Mountains, Lower California, 
Mexico. Altitude, 8,200 feet. 
Geogr. Distr. San Pedro Martir Mountains, Lower California, 
Mexico. Altitude, 7,000 to 8,200 feet. 
Genl. Char. Larger than T. fulvus; color less fulvous. 
Color. Upper parts mixed grayish brown and blackish, darkest 
on median line; side washed with pale fulvous; under parts grayish 
white; hairs plumbeous at base; around mouth and entrance to 
cheek pouches dusky; ear patch blackish; tail and feet grayish white. 
Measurements. Total length, 248; tail vertebra, 67; hind foot, 
31. Skull: total length, 44.5; basal length, 41; zygomatic width, 
25; mastoid width, 21; interorbital constriction, 9; length of nasals, 
16; width of nasals anteriorly, 5. 
337. aphrastus (Thomomys), Elliot, Pub. Field Colymb. Mus., 1903, 
p.219. Zodlogy. 
