332 VERTEBRATE ANIMALS OF THE UNITED STATES 



Subspecies of P. montanus 



P. m. utahensis Merr. Clay color; size larger: northern Utah. 

 P. m. richardsoni (Allen). Color ochraceous buff: Oklahoma. 

 P. ordi (Woodhouse). Clay color; tail brownish above; length 244 

 mm.; tail 140 mm.; hind foot 39 mm.: southern Texas. 



Subspecies of P. ordi 



P. 0. columbianus Merr. Color darker: valley of the Columbia in 

 western Oregon. 



P. agilis (Gambel) (Fig. 177). Color yellowish brown, mixed with 

 dusky; length 308 mm.; tail 182 mm.; hind foot 41 mm.: western Cali- 

 fornia, south of Lake Tulare. 



P. cabezoncB Merr. Color buffy ochraceous; length 282 mm.; tail 

 171 mm.; hind foot 42 mm.: deserts of southeastern California. 



P. goldmani Merr. Color drab-brown; length 312 mm.; tail 185 

 mm. ; hind foot 45 mm. : Salinas River Valley, California. 



P. ingens Merr. Size very large; color buffy ochraceous; length 350 

 mm.; tail 190 mm.: Carriso Plain, Arizona. 



P. longipes (Merr.). Color ochraceous buff; a large pure white 

 spot over each eye and another behind each ear; length 275 mm.; tail 

 165 mm.; hind foot 42 mm.: Painted Desert, Arizona. 



P. microps Merr. Color pale buff; length 270 mm.; tail 158 mm.; 

 iiind foot 40 mm.: Inyo County, California. 



P. morroensis Merr. Color dark buff; length 292 mm.; tail 177 mm.; 

 hind foot 44 mm. : San Luis Obispo County, CaHfornia. 



P. panamintinus Merr. Color buffy clay; length 301 mm.; tail 180 

 mm. ; hind foot 44 mm. : Panamint Mountains, California. 



P. per plexus Merr. Color yellowish-brown, mixed with dusky; 

 length 320 mm.; tail 195 mm.; hind foot 46 mm.: southern Sierras and 

 Tejon Mountains. 



3. Dipodomys Gray. Similar to Perodipus in size and coloration, 

 but with 4 toes on the hind foot: about 6 species in the United States. 



D. merriami Mearns. Back clay color, darkest on the head; under- 

 parts silky white; length 241 mm.; tail 143 mm.; hind foot 33 mm.: 

 California to Texas and southward into Mexico. 



Subspecies of D. merriami 



D.m. merriami Mearns. Southern Arizona to Texas. 



D. m. exilis Merriam. Color darker : San Joaquin Valley, California. 



D. m. kernensis Merr. Color pale buff: Kern County, California, 



