1884.] MURID.E FROM CENTRAL PERU. 455 



Calomys (s. s.), of whose subgeneric validity there can be no question, 

 although, judged by the skull only, it might be joined with the 

 great mass of Ilesperomyes to which I apply the name Oryzomys. 

 However, its members are so different externally from any of the 

 other Vesper-mice (see the subgeneric diagnoses given above), that 

 it is certainly worthy of the rank originally given it by Waterhouse. 

 The only species belonging to it are H. bimaculatus, gracilipes, and 

 eleyans, to which some authors would perhaps think H. lepidus 

 should be added as a distinct species ; but without seeing more 

 specimens of the true H. bimaculatus, I do not care to describe 

 the present form as more than a geographical variety of that 

 animal. 



7. Hesperomys (Vesperimus) cinereus, Thos. (?) S. No. 10. 

 a. One specimen, Maraynioc. 



a. J imm. 



A single immature male, in a bad state, is possibly referable to 

 this interesting species. It differs from the type, however, in 

 having the tips of the hairs rufous instead of grey, in its even more 

 hairy ears, and in its perfectly unicolor tail — characters often of 

 specific importance, but not sufficient to justify the description of a 

 new species from an immature specimen only. The skull and hind 

 foot of the typical specimen from North Peru are figured in Plate 

 XLIV. figs. 2-5. 



8. *Hesperomys (Habrothrix) scalops, Gay, Chili, Zool. i. 

 p. 108(1847). (Plates XLIII. fig. 1, and XLIV. figs. 1, 15, and 16.) 



Nine specimens : a toy, Junin ; 7* and i, Maraynioc. 



Fur soft, of medium length. General colour dark grey, tinged 

 on the back with chestnut. Muzzle and face, ears, feet, and lower 

 side of tail rich rufous, forming a marked contrast to the general 

 grey colour. Ears thickly haired, rather narrow, without a projec- 

 tion ; laid forward they just reach to the centre of the eye. Tail 

 hairy, bicolor, dark brown with a tinge of chestnut above, pale 

 rufous-yellow below. Belly dull grey. Soles naked, flesh-coloured, 



