296 PERODIPUS. 



Geogr. Distr. Known only from the type locality. Range unde- 

 termined. 



Genl. Char. Size medium; tail rather short; ears small. Skull: 

 rostrum, nasals, and premaxillae rather narrow; bullae rather large; 

 maxillary arch weak, narrow outer angle well developed; supraoccip- 

 ital and interparietal broad. 



Color. Upper parts dull buffy ochraceous, lined on head with 

 dark-tipped hairs ; end of nose dusky ; patch at base of whiskers dusky ; 

 usual pale spots at base and fold of ear ; dorsal tail stripe pale brownish 

 drab; under stripe narrowing towards tip, often not passing end of 

 vertebrae. 



Measurements. Average of 40 specimens from type locality. 

 Total length, 250; tail vertebrae, 140; hind foot, 40.8. 



a. Perodijnis inmitnnus Titahensis Merriam. 



Perodiptis montanus utahensis Merr., Proc. Biol. Soc. Wash., xvii, 

 1904, p. 143. 

 Utah Kangaroo Rat. 



Type locality. Ogden, Utah. 



Geogr. Distr. Range unknown. 



Genl. Char. Similar to P. tnontanus; hind foot smaller; upper 

 parts less fulvous; ears darker, the anterior fold dusky except at 

 extreme tip ; ventral tail stripe continuous to tip of pencil . 



Measurements. Total length, 260 ; tail vertebra, 150 ; hind foot, 41 



733. Perodipus ordi (Woodhouse). 



Dipodomys ordii Woodh., Proc. Acad. Nat. Scien. Phil., 1853, p. 



235- 

 Perodipus ordi Elliot, Syn. N. Am. Mamm., F. C. M. Pub., ii, 



1901, p. 238. Zool. Ser. Id. Mamm. Middle Amer. & W. 

 Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 350. Zool. Ser. 

 Ord's Kangaroo Rat. 



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

 Geogr. Distr. From the Snake Plains and their northward exten- 

 sions south into the State of Chihuahua, Mexico. 



a. Perodipus ordi palmeri (Allen). 



Dipodops ordii palmeri Allen, Bull. Am. Mus. Nat. Hist. N. Y., 



189T, p. 276. 

 Perodipus ordi palmeri Elliot, Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. I, 1904, p. 350. Zool. Ser. 

 Palmer's Kangaroo Rat. 



Type locality. San Luis Potosi, State of San Luis Potosi, Mexico. 

 Geogr. Distr. State of San Luis Potosi, Mexico. 



