536 Mr. O. Thomas on 
whether that is a semi-albinistic form of the common Taman- 
dua, or is a recognizable species or subspecies, [ am not at 
present prepared to assert, though I am rather inclined to the 
former idea. Mr. Robert says that its eyes were not red, 
but brown with black pupils, and he thought that its ears 
were a little longer than usual, though his measurements do 
not show this. 
In the skull there is no character by which it could be 
distinguished from the other specimens. All the skulls are 
very variable, especially as to the line of the fronto-nasal 
suture, which may vary from nearly directly transverse to 
deeply W-shaped, and in the relative development of the 
palatal and pterygoid inflations. 
23. Cabassous unicinctus, Linn. 
Ph ve: 
24, Dasypus sexcinctus, Linn. 
Skull. 
25. Tatu novemeinctus, Linn. 
ye 
26. Didelphis Azare, Temm. 
3, ¢ 
27. Marmosa cinerea, Temm. 
Si. 
28. Chironectes minimus, Zimm. 
26 
LXVIII.—New Species of Oryzomys, Proechimys, Cavia, 
and Sylvilagus from South America. By OLDFIELD 
‘THOMAS. 
In working out the Robert collection from the Rio Jord&o 
the following allied species from other localities have proved 
to need description :— 
Oryzomys bolivie, sp. 0. 
A Bolivian representative of O. intermedius ; tail shorter 
and molars smaller. 
Size and general proportions as in the allied species, 
