350 PERODIPUS. 



355. ordi (Dipodomys), Woodh., Proc. Acad. Nat. Scien. Phil., 1853, 



p. 235. Elliot, Syn. N. Am. Mamm., 1901, p. 238. 

 ORD'S KANGAROO RAT. 



Type locality. El Paso, El Paso County, Texas. 



Geogr. Distr. State of Chihuahua, Mexico, north to Snake Plains. 



Gcnl. 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 vertebrae, 134; hind foot, 

 38; ear, 7. 



a. palineri (Dipodops}, Allen, Bull. Amer. Mus. Nat. Hist., 1891, 



p. 276. 

 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 vertebras, 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, 11.4; 

 length of mandible, condyle to tips of incisors, 17.8 ; height at coronoid 

 process, 5.8. 



356. chapman! (Dipodomys), Mearns, Bull. Am. Mus. Nat. Hist., 



1890, p. 291. Elliot, Syn. N. Am. Mamm., 1901, p. 237. 

 CHAPMAN'S KANGAROO RAT. 



Type locality. 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 vertebrae. 



Measurements. Total length, 280; tail vertebrae, 148; hind foot, 

 38. Skull: total length, 37.2; zygomatic width, 17; Hensel, 23.5; 



