some South' American MuriJw. 141 



The following are also referable to the genus : — 

 Eligmodontia hirtipes, Thos. (described as Phyllotis 

 liirlipes). 



,, moreni, Thos. [Eligmodon moreni). 



,, inorganic All. 



,, inorgani pamparum, Thos. 



Hesperomys, Waterh., 1839. 

 Syn. CaloDvja, Waterh., 1337, nee Cullomys, d'Orb. & Geoff., 1830. 



Size small or medium. Form delicate. Ears short. Tail 

 short, rarely attaining tiie length of the head and body. 

 Feet normal, slender, the pads 5-0, not covered by hair ; 

 surface of palms and soles generally naked, but occasionally 

 hairy. Mammae variable, ranging from 2 — 2 =8 or 3 — 2 = 10 

 to a continuous scries attaining a total of 14, different num- 

 bers often occurring in the same species. 



Skull delicate, lightly built, the supraorl/ital edges square 

 in old specimens, divergent and slightly ridged in the larger 

 species ; zygomatic plate not cut back anteriorly. 



Molars small, brachyodont. 



Type. H. bimaculatus {Mas himaculcUus, Wafcerh.). 



Other species : — 



Hesperomys callosus, Rengg. {Mas callosus). 



„ „ bolivice,Thos.{7^ligmodo7i(ia cholivice). 



,, carilla, Thos. {Eligmodontia carilla). 



,, ducilla, Thos. (/i'. dacilla). 



„ e.rpidsus, Lund (Mas expulsus). 



„ gracilipes, Waterh. [Mus gracilijjes). 



,, laucha, Desm. {Mus Inucha). 



„ ,, muscalinus, Thos. (^Eligmodontia I. 



musculina). 



., lepidus, Thos. ( Hesperomys bimaculatus lepidus). 



„ sorella, Thos. (^Eligmodontia sorella). 



,, tener, Winge. 



„ venustus, Thos. {Oryzomys (?) vennstus). 



Graomys, gen. nov. 



Size comparatively large. General appearance graceful, 

 with long ears and long fine fur. Tail longer than head ami 

 body, thickl}' hairy, pencilled terminally, prominently bicolor. 

 Feet normal, with the usual j)ads small and well defined, 

 the space between them coarsely granulated. Mamma; 

 2—2 = 8. 



