PERODIPUS. 



349 



72. Perodipus. Five-toed Kangaroo Hats. 



I. 1 " 1 ; M.^ 16. 



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 bullae 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 TO THE SPECIES. 



A. Hind feet with five toes. 



a. Above ochraceous buff and black P. ordi 



b. Above brownish ochraceous and black P.O. palmeri 



c. Above mouse gray and black P. chapmani 



d. Above gray brown suffused with fulvous P. obscurus 



e. Above ashy brown and black P. agilis 



PAGE 



35 

 35 

 350 



