350 PERODIPUS. 
355. ordi (Dipodomys), Woodh., Proc. Acad. Nat. Scien. Phil., 1853, 
p. 235. Elliot, Syn. N. Am. Mamm., rgo1, p. 238. 
Orv’s KanGaroo Rat. 
Type locality. El Paso, El Paso County, Texas. 
Geogr. Distr. State of Chihuahua, Mexico, north to Snake Plains. 
Genl. Char. Size medium; tail little shorter than head and body. 
Color. Above ochraceous buff, darkest on back, mixed with 
black on rump; sides paler; side of nose, spot behind the ear, stripe 
across thigh, and under parts, white; tail with dorsal and ventral 
stripes dusky, pencil dusky, base of hairs white. 
Measurements. Total length, 240; tail vertebre, 134; hind foot, 
385 ear, 74 
a.—palmeri (Dipodops), Allen, Bull. Amer. Mus. Nat. Hist., 1891, 
puceyzo: 
PALMER’S KANGAROO Rat. 
Type locality. San Luis Potosi, State of San Luis Potosi, Mexico. 
Geogr. Distr. State of San Luis Potosi, Mexico. 
Genl. Char. Similar to P. ordi, but darker. 
Color. Upper parts brownish ochraceous, mixed with black; 
under parts, arms (excepting a patch of buff), band across thigh 
and hind feet white; tail dusky brown, with narrow lateral white 
stripes, tip dusky brown; ears whitish, with a dusky patch on outer 
anterior border, and another on inner lower posterior border. 
Measurements. Total length, 249; tail vertebra, 141; hind foot, 
35; ear, 11.4. Skull: total length, 38; basal length, 25.4; mastoid 
width, 24; interorbital constriction, 13.2; length of nasals, ‘I1.4; 
length of mandible, condyle to tips of incisors, 17.8; height at coronoid 
process, 5.8. 
356. chapmani (Dipodomys), Mearns, Bull. Am. Mus. Nat. Hist., 
1890, p. 291. Elliot, Syn. N. Am. Mamm., 1901, p. 237. 
CHAPMAN’S KaNGAROO Rat. 
Type locahty. Forte Verde, Yavapai County, Arizona, Mexico. 
Geogr. Distr. State of Sonora, Mexico, north into Arizona. 
Genl. Char. More slender than C. ordi, tail longer, and color 
darker. Skull lighter, smaller. 
Color. Above mouse gray, mixed with black and buff; sides 
sandy buff; usual line on side of nose, ear, and eye spots, and thigh 
stripe white; under parts white; dorsal and ventral stripes on tail 
drab gray; lateral white stripes extending to near end of vertebre. 
Measurements. Total length, 280; tail vertebre, 148; hind foot, 
38. Skull: total length, 37.2; zygomatic width, 17; Hensel, 23.5; 
