1901.] Allen, Mammals from Peru. 43 



being the prevailing tint above, while others are uniform yellow- 

 ish rufous above, with every intermediate stage. 



8. Oxymycterus juliacae Allen. A second specimen, an 

 adult male, closely resembles the type (/. c., p. 223) from which 

 only the species was previously known. Both were collected at 

 Inca Mines. 



9. Oxymycterus apicalis Allen. An additional series of 9 

 specimens, all adult except one, which is only about one third 

 grown. This is grayer below and less gray above than adults. 

 In other respects the specimens are like those previously recorded. 

 The white tip to the tail is a prominent feature in all. 



10. Oryzomys keaysi Allen. Five specimens, all adult, and 

 like those previously described (/. c., p. 225), and from the same 

 locality. 



11. Oryzomys obtusirostris Allen. One specimen, adult 

 male, Inca Mines, June 16. The faint yellowish wash on the 

 upper parts is rather more pronounced than in the type, and the 

 general coloration above is consequently less blackish than is in- 

 dicated in the description of the species (/. ^., p. 225). 



* T2. Oryzomys stolzmanni Thomas. One specimen, an 

 adult female, Inca Mines, May 5, 1900. 



* 13. Rhipidomys ochrogaster, sp. nov. 



Type, No. 16481, ?ad., Inca Mines, Peru (alt. 6000 feet), Sept. 14, 1900; 

 coll. H. H. Keays. 



Above dull yellowish brown, minutely varied with black-tipped hairs, paler 

 and more yellowish on the sides ; a slight dusky eyering ; beneath pale ochra- 

 ceous buff, the hairs at the extreme base pale gray ; ears blackish brown, well 

 haired externally, nearly naked within ; upper surface of feet, including toes, 

 dusky grayish brown, with longer whitish hairs at the base of the claws ; tail 

 uniform blackish, the proximal half scantily haired, the hairiness increasing 

 apically, in some specimens wholly concealing the annulations, with a long 

 bushy pencil at the end, the hairs extending as a heavy tuft 20 mm. beyond the 

 vertebrae. Mammae, 6, 4 inguinal, 2 pectoral. 



Measurements. Type, total length, 382 mm.; head and body, 154; tail to 

 end of vertebrae, 228 ; hind foot, 35 ; ear (in dry skin) from notch, 19. Another 

 specimen, also a female, measures, total length, 405 ; head and body, 164 ; 

 tail, 241 ; hind foot, 38. 



Skull (of type), total length, 37 ; basal length, 31 ; palatal length, 15 ; nasals, 

 14 ; zygomatic breadth. 19.5 ; interorbital breadth, 6 ; mastoid breadth, 10 ; 

 palatal foramina, 8x3; upper tooth-row, 6. 



This species is based on two females, both adult, but one a 



