DIPODOMYS. 34:i 



hairy; hind foot with four toes only; cheek pouches large; fur of 

 velvet softness. All the species of both genera have facial crescentic 

 lines more or less distinctly marked; side of mouth white; white 

 spot over the eyes and another behind the ear, and a white stripe 

 across the thighs, usually reaching the tail; digits four. 



KEY TO THE SPECIES. 



A. Hind foot with four toes. 



a. Under parts white. PAGE 



a.' Above sepia brown D. phillipsi 343 



b/ Above golden clay color D. ornatus 344 



c.' Above mixed brownish clay color and 



black D. perotensis 344 



d/ Above yellowish brown and black D. mitchclli 344 



e.' Above pale yellowish brown D. dcscrti 345 



f/ Above ochraceous buff and black D. spcctabilis 345 



g/ Above mouse gray, tinged with pinkish 



buff D. mcrriami 345 



h.' Above buffy drab and pale buff D. m. ambiguus 346 



i.' Above buffy gray D.m. parvus 346 



j.' Above cinnamon D.m. simiolus 347 



k/ Above pinkish buff D.m. arenivagus 347 



I/ Above dark clay color D.m. atronasus 348 



m/ Above mixed pale ochraceous buff and 



black D. m. melanurns 348 



348. phillipsi (Dipodomys), Gray, Ann. Mag. Nat. Hist., vn, 1841, 



p. 522. 

 PHILLIPS' KANGAROO RAT. 



Type locality. Real del Monte, north end of Valley of Mexico. 



Geogr. Distr. Valley of Mexico, State of Mexico, and States of 

 Puebla, eastern Tlaxcala and western Vera Cruz, Mexico. 



Genl. Char. Size small; colors dark; tip of tail white. Skull: 

 interorbital constriction very considerable; mastoids relatively small 

 and separated on top of skull; superior outline arched. 



Color* Above sepia brown and ochraceous mixed with black; 

 sides of nose, spot at base of ear, stripe across thigh, and under parts 

 white; stripe across nose from base of whiskers and base of tail 

 black; tail black above and below, sides and tip white. 



Measurements. Total length, 270; tail vertebrae, 168; hind foot, 

 41. Skull: occipito-nasal length, 42; Hensel, 29.5; zygomatic width, 

 22; mastoid width, 28; width of parietal, 19.5; posterior width of 

 basioccipital between bullae, 5.5; palatal length, 17; postpalatal 



