PERODIPUS. 349 
72. Perodipus. Five-toed Kangaroo Rats. 
ia eA x 
Ti; M. 
ie TO. 
2 [Oo 
val ben 
oxy ies) 
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-liké zygomata; audital bulle 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. 
Fic. 66. PERODIPUS CHAPMANI. 
No, 802 Field Columbian Mus. Coll. Nat. size 
UPPER TOOTH ROW. LOWER TOOTH ROW. 
Enlarged 7 times. Enlarged 7 times. 
KEY TO THE SRECIES. 
A. Hind feet with five toes. PAGE 
pee bOoVe Ockraceous bit. and blacke,. iG. ... ise. P’, (Cra so 
b. Above brownish ochraceous and black....... P.o. palmert 350 
Caps pove mousesray and black. ...g0...a4.0...% P.chapmant 350 
d. Above gtay brown suffused with fulvous .....P. obscurus 351 
Comanove sar brown and black) 2o.)....2g.... <a. P. agitseeass 
