DIPODOMYS. 91 



Type locality. Onyx, west end of Walker Pass, Kern County, 

 California. 



Genl. Char. Size small, color pale, similar to D. nevadensis. 

 Skull- square, zygomata widely spreading; nasals long and mastoids 

 small. 



Color. Head and upperparts pinkish buff; rest of pelage, limbs, 

 hands and feet pure white; tail Prout's brown, sides white and tuft 

 purplish brown! Ex type in United States National Museum. 



Measurements. Total length, 240; tail, 140; hind foot, 37. 

 Skull: Occipito-nasal length, 32.5; Hensel, 21.5; zygomatic width. 

 16; in tertemporal width, 13.1; length of nasals, 12.6; palatal length, 

 7.1; length of upper molar series, 4.5; length of mandible, 3.2; length 

 of lower molar series, 3.6. Ex type in United States National 

 Museum. 



Dipodomys platycephalus Merriam. 



Dipodomys platycephalus Merr., Proc. Biol. Soc. Wash., XX, 1907, 

 p. 76. 



Type locality. Calmalli, Lower California, Mexico. 



Genl. Char. Similar to D. insularis but darker; tail sooty. Skull 

 larger, with larger mastoids. 



Color. General color ochraceous-buff lined with dark hairs, ankles 

 same hue; underparts white; limbs, hands and feet white; tail above 

 and beneath mixed buff and brown; sides white, long tuft at top 

 purplish. Ex type in United States National Museum. 



Measurements. Total length, 238; tail, 145; hind foot, 38. Skull: 

 Occipito-nasal length, 34; Hensel, 21.2; zygomatic width, 37.8; 

 intertemporal width, 14.1; length of nasals, 13.8; palatal length, 7.3; 

 length of upper molar series, 4.2; length of mandible, 10.5; length of 

 lower molar series, 4.4. Ex type in United States National Museum. 



Dipodomys nelsoni Merriam. 



Dipodomys nelsoni Merr., Proc. Biol. Soc. Wash., XX, 1907, p. 75. 



Type locality. La Ventura, Coahuila, Mexico. 



Genl. Char. Smaller than D. spectabilis; zygomatic arch not so 

 wide; mastoids of nearly equal size. 



Color. Upperparts grizzled buff, tinged on rump and flanks with 

 vinaceous; underparts white, outer side of limbs white, inner side 

 blackish brown; tail above black; lateral white stripe for about two- 

 thirds the length beneath dusky brown, end not tufted, white. Ex 

 type in United States National Museum. 



Measurements. Total length, 330; tail, 204; hind foot, 50. Skull: 

 Occipito-nasal length, 41.3; Hensel, 29.1; zygomatic width, 21.1; 



