344 DIPODOMYS. 
length, 12; length of bulla, rr.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., 1x, 1894, 
p. Tres 
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 vertebre, 167; hind foot, 39. 
350. perotensis (Dipodomys), Merr., Proc. Biol. Soc. Wash., 1x, 
1894, p. III. 
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 vertebre, 162; hind foot, 
40. 
351. mitchelli (Dipodomys), Mearns, Proc. U. S. Nat. Mus., 1897, 
XI yt 0. 
TrBuRON 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, 110; tail vertebra, 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.) 
