344 DIPODOMYS. 



length, 12; length of bullae, 11.5; length of upper tooth row, alveolar 

 border, 5; length of mandible, 18.5; length of lower tooth row, 5. 



349. ornatus (Dipodomys), Merr., Proc. Biol. Soc. Wash., ix, 1894, 



p. no. 

 ORNAMENTED KANGAROO RAT. 



Type locality. Berriozabal, State of Zacatecas, Mexico. 



Geogr. Distr. State of Zacatecas, Mexico. 



Genl. Char. Similar to D. phillipsi; hind "foot shorter. Upper 

 premolar without the antero-internal lobe. 



Color. Above golden clay color; head and median line of back 

 darker; orbital ring, facial crescents, and inner sides of hind legs 

 black; stripes on thighs and under parts white; tail black above and 

 below, sides and tip white. 



Measurements. Total length, 274 ; tail vertebrae, 167 ; hind foot, 39. 



350. perotensis (Dipodomys), Merr., Proc. Biol. Soc. Wash., ix, 



1894, p. in. 

 PEROTE KANGAROO RAT. 



Type locality. Perote, State of Vera Cruz, Mexico. 



Geogr. Distr. State of Vera Cruz, Mexico. 



Genl. Char. Similar to the preceding species in color and cranial 

 characters, the differences being mainly comparative, viz., skull nar- 

 rower on top, more arched; breadth of supra-occipital between 

 mastoids greater; angle of mandible larger. 



Color. Above brownish clay mixed with black on head and back ; 

 sides ochraceous buff; facial crescents and inner side of hind leg 

 black; tail black, with white side stripes and tip. 



Measurements. Total length, 271; tail vertebras, 162; hind foot, 

 40. 



351. mitchelli (Dipodomys) , Mearns, Proc. U. S. Nat. Mus., 1897, 



xix, p. 719. 

 TIBURON ISLAND KANGAROO RAT. 



Type locality. Tiburon Island, Gulf of California, Mexico. 



Geogr. Distr. Known only from type locality. 



Genl. Char. Similar to D. m. simiolus Rhoads, but smaller. 



Color. Above yellowish brown mixed with black on back; sides 

 ochraceous buff; under parts white; tail black, with white side stripes, 

 pencil grayish; ears black inside, yellowish outside; stripe on under 

 side of hind foot black. 



Measurements. Total length, no; tail vertebrae, 130; hind foot, 

 38.5. (ex Type.) Skull: total length, 36.5; breadth of skull, 22.5; 

 length of nasals, 13.3. (Mearns, 1. c.) 



