374 



HETEROMYS. 



Genl. Char. Soles 6-tuberculate ; tail half as long as head and 

 body. 



Color. Head dark gray; upper parts black, mixed with ochre 

 yellow, base of all the hairs white; flat grooved spines, with black 

 tips; the stiff hairs with a black ring and reddish yellow tip, these 

 last distributed sparingly over the head and rump; tip of nose, lips, 

 inner sides of arms and legs and under parts of body white; tail 

 above black, beneath white; ears naked on outer side, black on inner. 



Measurements. Total length, 240; tail, 95 ; hind foot and claw, 30. 



B. Liomys. 

 T '-i. p 1=1- M 3 ~ 3 = 20 



'i i ' *i i ' '3 3 



Pelage harsh; tail well haired; molars with two parallel trans- 

 verse loops, without "additional lobes or permanent enamel islands," 

 uniting in old animals and forming a horseshoe as in Heteromys. 



FIG. 70. HETEROMYS ILIOMYS> ALBOLIMBATUS. 



No. 8673 Field Columbian Mus. Coll. Nat. size. 



LOWER TOOTH ROW. UPPER TOOTH ROW. 



Enlarged 6 times. Enlarged 6 times. 



KEY TO THE SPECIES AND SUBSPECIES OF THE SUBGENUS. 



A. Soles 5-tuberculate. PAGE 



a. Above mixed black and yellowish black. .H. albolimbatns 375 



b. Above mixed gray and pale fulvous H. can us 375 



c. Above blackish and buffy H. alleni 376 



d. Above grizzled gray. 



a/ Dark "saddle" on middle of back H. torridus 376 



b.' No "saddle" on middle of back H. t. minor 377 



e. Above mixed buff and brownish black H. exiguus 377 



f. Above grizzled fulvous and black H. plantinarcnsis 377 



