530 Mr. O. Thomas on Mammals 
Sao Paulo to Rio Grande do Sul. Closely related to it is 
O. bolivie, described in the succeeding paper. 
11. Oryzomys laticeps, Lund. 
iso Ke 
These specimens show a considerable amount of variation 
in colour, especially in the relative proportions of grey and 
fulvous on the back and sides. Among them there are 
examples closely agreeing with one from Lagoa Santa deter- 
mined as “ Q. saltator’”” by Winge, that being the original 
O. laticeps, Lund. 
12. Oryzomys eliurus, Wagn. 
3d. 
13. Akodon sp. 
D Gp eee 
One of the olive-coloured species of the genus, perhaps 
A. brachyurus, Wagn. Not at present certainly determinable. 
14. Oxymycterus Roberti, sp. n. 
A member of the large long-snouted group, paler in colour 
than the other known species. 
Size about as in O. nasutus. Fur close, straight, and 
finer, but not hispid; hairs on back about 10 millim. in 
length, therefore rather shorter than in the allied species. 
General colour above without iridescence, heavily lined 
fulvous grey, greyer on the head and fore back, more fulvous 
on the middle back, where it is slightly more fulvous than 
Ridgway’s “tawny olive.” The colour is therefore very 
different from the deep reddish brown of the other Brazilian 
species of Oxymycterus. Sides paler and greyer. Under 
surface dull greyish buffy, the bases of the hairs slaty grey, 
the tips washed with paler yellowish buffy, not marked 
along the middle line. Line of demarcation on sides not 
defined. Chin, as usual, white. Snout, centre of face, crown, 
and nape mixed black and yellowish white, producing a 
strongly grizzled grey ; eyes small, without lighter rings; 
cheeks washed with pale fulvous. Hars of medium length, 
thickly hairy, grizzled like the head, with which they are 
quite concolor. Arms and legs like body; upper surface of 
hands and feet dull brown; longest anterior claws about 
4 millim. in length, measured above, longest posterior about 
