PERODIPUS. 349 
72. Perodipus. Five-toed Kangaroo Rats. 
| z= M2 3— 16. 
) 
I I 
Perodipus Fitzin., Sitz. Math.-Natur. Classe, K. Akad. Wiss. Wien., 
1867, LVI, p. 126. Type Dipidomys agilis Gambel. 
Dipodops Merr., N. Am. Faun., 1890, No. 3, p. 72. 
Skull similar to that of Dipodomus, with greatly developed mas- 
toids and thread-like zygomata; audital bullz in contact below basi- 
sphenoid; hind feet with five toes, the first digit rudimentary, but 
having a claw, and reaching to the end of the metatarsal bones of 
the other digits. 
FiG. 66. PERODIPUS CHAPMANI. 
No. 802 Field Columbian Mus. Coll. Nat. size 
UPPER TOOTH ROW LOWER TOOTH ROW. 
Enlarged 7 times. Enlarged 7 times. 
KEY LO LAE SPECIES: 
A. Hind feet with five toes. PAGE 
a. Above ochraceous buff and black... P01. 356 
b. Above brownish ochraceous and black. . .P.o. palmert 350 
c. Above mouse gray and black...... P.chapmant 350 
d. Above gray brown suffused with fulvous . .P. obscurus -351 
€ Above ashy brown and black........... SPROLNIS 205 
