new Sigmodon, Oryzomys, de. from Ecuador. 449 
This rice-rat is remarkable for its dark colour, short crisp 
fur, aud unusually heavy incisors, in which characters’ it 
ditfers from all the known Ecuadorean species. Allen’s 
S. chonensis, nearest in locality, is said to be “ warm buff,” a 
colour very different from the rich brown of this animal. One 
of his specimens, however, from the Rio de Oro, which is 
stated to be “ markedly different from the rest of the series, 
with much deeper coloration,” is not impossibly really refer- 
able to this species. 
It is named in honour of my friend Prof. Einar Liénnberg, 
to whose kindness I owe the opportunity of working out this 
Kceuadorean collection. 
Oryzomys barbacoas ochrinus, subsp. n. 
Like O. barbacoas, All., of S.W. Colombia, but brighter 
and more vivid ochraceous buff. 
Size and general essential characters very much as in 
barbacoas, including the remarkably s'out skull, with strong 
ridges, narrow nasals, short palatal foramina, and the thick 
and very opisthodont incisors. Fur crisp, hairs of back about 
10 mm. in length. General colour above rich glossy 
“ochraceous buff,” slightly darkened on back, bright and 
rich on sides (not unlike the colour in the type of O. tectus). 
Under surface paler buffy, without line of demarcation. 
Hands with brown metacarpus and whitish digits; feet 
brownish white. Tail finely scaled (16 rings to the em.), 
almost naked, pale brown above, lighter below. 
Skull much as in barbacoas, but muzzle broader and 
breadth across molars less, 
Diniensions of the type :— 
Hind foot 33 mm. 
Skull: greatest length 34°8; condylo-basal length 32:7; 
zygomatic breadth 18; nasals, length 13°3, breadth at 
half their length 3; breadth of muzzle at same point 7:2; 
interorbital breadth 5°9 ; breadth across parietal ridges 12°3; 
palatilar length 15°3; palatal foramina 5; upper molar 
series 5°7; breadth across molars externally 7. Incisive 
index 61°. 
Hab. Ecuador, west of Quito. 
Type. Adult male. B.M. no. 21. 2.15.4. Original num- 
ber 12. Collected for Mr. L. Séderstrém, and received in 
exchange from the Stockholm Museum. 
This remarkable Oryzomys, by its peculiar skull-characters 
and its opisthodont incisors, is quite unlike anything in the 
British Museum collection, but would seem to be allied to 
