92 PERODIPUS. 



intertemporal width, 14.2; length of nasals, 13.4; palatal length, 9.2; 

 length of upper molar series, 6; length of mandible, 13.8; length of 

 lower molar series, 5.2. Ex type in United States National Museum. 



Dipodomys spectabilis cratodon Merriam. 



Dipodomys spectabilis cratodon Merr., Proc. Biol. Soc. Wash., XX, 



1907, P- 75- 



Type locality. Chicalote, Aguas Calientes, Mexico. 



Genl. Char. Similar in appearance to D. spectabilis, but having a 

 larger skull, and heavier and broader incisors. 



Color. Top of head pale ochraceous-buff; upperparts ochra- 

 ceous-buff, the black bases of hairs showing; flanks clear buff; spot 

 behind ears, lips, root of tail and entire rest of pelage including limbs, 

 hands and feet, pure white; tail above on basal half dark brown, 

 remainder black, tip white; beneath dark brown. Ex type in United 

 States National Museum. 



Measurements. Total length, 324; tail, 217; hind foot, 52.5. 

 Skull: Occipito-nasal length, 45.2; Hensel, 32.7; zygomatic width, 

 24.1; intertemporal width, 17.5; length of nasals, 16.5; palatal length, 

 1 1. 8; length of upper molar series, 6.2; length of mandible, 16.8; 

 length of lower molar series, 6.1. Ex type in United States National 

 Museum. 



Genus Perodipus (96). 



Perodipus perplexus Merriam. 



Perodipus perplexus Merr., Proc. Biol. Soc. Wash., XX, 1907, p. 79. 



Type locality. Walker Basin, Kern County, California. 



Genl. Char. Skull resembles that of P. panamintinus, and is 

 squarish in shape, and smaller, with interparietal and basi-occipital 

 narrower. 



Color. Nose and space before eyes pale ochraceous-buff; top of 

 head and upperparts ochraceous-buff, mixed with black; flanks clear 

 ochraceous-buff; cheeks, usual streak across thighs, entire underparts, 

 limbs, hands and feet pure white; thighs like upperparts; tail dark 

 brown for half the length from base, remainder white. Ex type in 

 United States National Museum. 



Measurements. Total length, 213; tail, 186; hind foot, 41.9. 

 Skull: Occipito-nasal length, 40; Hensel, 27; zygomatic width, 19.8; 

 intertemporal width, 12.3; length of nasals, 13.9; length of upper 

 molar series, 4.8; length of mandible, 12.5; length of lower molar 

 series, 4.9. Ex type in United States National Museum. 



