some South- American Muridae. 143 



Incisors strongly and clearly grooved. Premaxillo- 

 maxillary suture bowed forwards below. 

 Type as above. 



Otlier species : — 



Euneomys fossor^ Thos. {Reithrodon fossor), 



,, mordax, Thos. 



„ petersoni, All. 



ArLiscoMYS, Osgood, 1915, 



Tail medium or rather short. Palms and soles naked. 

 Incisors faintly or not grooved. Premaxillo-maxillary 

 suture mainly vertical. 



Type. E. {Auliscomys) picius {Reithrodon pictus, Thos.) . 



Other species : — 



Euneomys (Auliscomys) holiviensis, Waterh. {Phyllotis 



hoUviensis) . 

 „ ,, „ flavidlor, Thos. 



[Phyllotis b.Jlavidior). 

 „ „ decoloratus, Osgood. 



„ „ micropus, Waterh. [Mus micro- 



pus) . 

 ,, „ suhlimisy Thos. [Phyllotis sub- 



limis) . 

 „ „ xanthopygus^ Waterh. [Mus 



xanthopygus). 



Galenomys, subgeu. uov. 



Tail very sliort, barely 1^ times the length of the hind 

 foot ; palms and soles partially hairy. 



Zygomata especially widely expanded anteriorly. Naso- 

 frontal region flattened. Zygomatic plate slanting, not 

 projected forward above. 



Incisors narrow, much thrown forward, not grooved. 



Type. Euneomys (^Galenomys) garleppi [ Phyllotis garleppi, 

 Thos.). 



The striking external appearance of " Phyllotis '' garleppi^ 

 recalling that of Onychomys, always appeared to indicate 

 more than merely specific distinction from other members of 

 the group ; but upon only a single specimen with imperfect 

 skull I have not hitherto ventured to separate it. It is^ no 

 doubt, most nearly related to E. [Auliscomys) holiviensis, but 

 may be distinguished by the characters above noted. 



