DIPODOMYS. 347 
Geogr. Distr. Lower California, Mexico, into southern California. 
Genl. Char. Similar to D. merriami, smaller, tail longer and 
without black markings on face and nose. 
Color. Above buffy gray, sides buff; under parts white; usual 
white eye and ear spot, and stripe on thighs; dark dorsal and ventral 
tail stripes brownish black; pencil sooty black; lateral stripes white; 
orbital ring black; under surface of hind foot brownish. 
Measurements. Total length, 248; tail vertebre, 154; hind foot, 
35; ear, ro. Skull: basilar length, 21; mastoid breadth, 22.5; inter- 
orbital constriction, 13; length of nasals, 13; length of upper molar 
series on crowns, 3.6; length of mandible, 13.9; height of coronoid 
process from angle, 5.1. 
c.—simiolus (Dipodomys), Rhoads, Proc. Acad. Nat. Scien. Phil., 
1893, p. 410. Elliot, Syn. N. Am. Mamm., rgor, p. 234. 
similis Rhoads, Proc. Acad. Nat. Scien. Phil., 1893, p. 411. Elliot, 
oyn. N,. Am. Maimm:, 1ger, p. 234. 
ALLIED KaNGAROO Rat. 
Type locality. Agua Caliente, Mojave Desert, California. 
Geogr. Distr. Lower California and State of Sonora, Mexico, into 
California. 
Genl. Char. Similar to D. deserti, but smaller; pencil not white. 
Color. Above pale yellowish brown like D. desertt, inclining to 
cinnamon on rump; beneath white; tail, upper fourth dark ashy 
extending to tip, brownish black on middle third of under side; feet 
white, soles shghtly darker. 
Measurements. Total length, 241; tail vertebre, 149; hind foot, 
38; ear from crown, 9; pencil, 35. Skull: basilar length, 21.8; mastoid 
breadth, 24; interorbital constriction, 14.5; length of nasals, 13; 
length of mandible, angle to base of incisors, 13.8; coronoid process 
from angle, 5.6. 
d.—arenivasus Elliot, Pub. Field Columb. Mus., 111, 1903, p. 249. 
Zoology. 
Type locality. San Felipe, Lower California, Mexico. 
Genl. Char. Size small, similar to D. m. simiolus, but paler; ear 
larger; hind foot shorter. Skull narrower across mastoids and parietal ; 
nasals shorter. 
Color. Upper parts pinkish buff, palest on the head and darkest 
on rump, the plumbeous under fur showing in places; no black 
streaks on face; white spots behind ears and above eyes; upper parts 
of sides from eye to rump like color of rump; nose, sides of face, 
lower part of flanks, entire under parts and limbs, pure white; a 
narrow line of pinkish buff across thighs; hands yellowish white, 
