58 Mr. O. Thomas on 
A, Marmosa* murina, L. 
One specimen. 
From Bogota some skins of Muride have been received, 
among which are specimens apparently referable to Oryzomys 
minutus, Tomes, O. spinosus, Thos., O. gracilis, Thos., and, 
addition, the following new species :— 
1. Oryzomys princeps, sp. 0. 
Size large, proportions very much as in Mus rattus. Fur 
Jong (about 14 millim. on back), soft, but not specially fluffy. 
General colour a rich orange-rufous, darkened along the 
middle line above, richer along the sides, brightest though 
palest on the belly, where the hairs for their terminal third are 
a clear orange-buff. Line of demarcation not marked. Ears 
of medium size, fairly well haired, black. Hands and feet 
dark brown on the metapodials mesially, silvery whitish 
laterally and on the digits; fifth hind toe reaching just past 
the base of the fourth. Tail very long, well haired but not 
tufted, uniformly blackish brown throughout. 
Skull with a long flattened muzzle, so that the profile is 
perfectly straight from the vertex on the middle of the parietals 
to the tip of the nasals. Interorbital space narrow, concave 
above mesially, its edges square but not beaded. Zygomatic 
plate straight in front, not projecting. Palatal foramina large 
and well open, reaching back just to the level of the front 
of ™1, Bulle small. 
Molars very large, broad and squarish, the projecting cusps 
prominent. 
Dimensions of the type (an adult male skin) :— 
Head and body 181 millim.; tail 226; hind foot 35; 
ear (c.) 17. a) 
Skull : basal length 36, basilar length 33°3, greatest breadth 
21°8; nasals 15°6x4°9; interorbital breadth 5:2; inter- 
parietal 4:1 x 11°8; palate length from henselion 18 ; diastema 
10:6; palatal foramina 8:2x3°5; length of upper molar 
series 7°. 
This fine species is one of the handsomest of the whole 
group, equalling or surpassing in beauty the Rio Janeiran 
O. ferrugineus described last year, although its colour is 
* Manrmosa, Gray (1821). 
Syn. Asagis, Gloger (1841). 
Micoureus, Less. (1842). See Ann. & Mag. Nat. Hist. (6) xv. 
p: 190, footnote. 
