352 Mr. 0. Thomas on some 



on the sides, along which from cheeks to rump there is a 

 fairly marked line of this colour. Under surface pale 

 yellowish buff, whiter on the chest ; belly-hairs slaty grey 

 only at their extreme bases. Ears rather small, their sub- 

 stance brown, but their thickly set hairs fulvous. Upper 

 surface of hands and feet dull whitish buff; fifth hind toe, 

 without claw, reaching to the end of the first phalanx of the 

 fourth. Tail thinly haired, brown, rather paler beneath, 

 especially proximally. 



Skull broad and rather flattened, strongly made; muzzle 

 short and broad ; interorbital region broad, flattened, with 

 marked supraorbital ledges overhanging the orbits and running 

 back as well-marked ridges to the back of the parietals. 

 Palatine foramina short, of moderate breadth. 



Dimensions of the type (an adult male in skin) : — 



Head and body 116 millim. ; tail 129 ; hind foot (moistened) 

 23'8; ear (shrunk) 14'5; heel to front of last foot-pad 10. 



Skull : tip of nasals to front of interparietal 26 ; greatest 

 breadth (c.) 16 - 5 ; nasals, length 11, breadth 3*5; inter- 

 orbital breadth 5'2 ; interparietal, length 4*1, breadth 102 ; 

 length of outer wall of infraorbital foramen 3*1 ; palate length 

 from henselion 13 ; diastema 7'7 ; palatal foramina 4*8 x 2*1 ; 

 upper molar series 4'8. Lower jaw : condyle to incisor-tip 

 1 8"8 ; height of ramus below ^\ 4'5. 



Hob. Mericla, Venezuela. Coll. A. Mocquerys, April 

 1894. 



Type: B.M. 94.9.25.14. 



Although this species seems allied to the Trinidad 0. speci- 

 osus and trinitatis, All. & Chapm., there are too many 

 differences in the detailed skull measurements for it to be 

 assigned to either of them. 



Oryzomys ferrugineus, sp. n. 



Size rather large. Fur thick and straight, the hairs of the 

 back about 11 millim. in length. General hue a brilliant 

 rust-colour (near " orange-rufous " of Ridgway) all over the 

 head and upper surface, in brilliancy far exceeding any other 

 species known to me, and even killing the colour of Neotoma 

 ferruginea. The head and centre of the back are somewhat 

 lined with black, but the cheeks and sides are quite clear and 

 bright. Under surface white, with a decided wash of yel- 

 lowish on the belly ; no slate-colour at the bases of the hairs ; 

 line of demarcation on sides sharply defined. Upper lip rust- 

 coloured like the rest. Eyes without a dark ring, the blackness 

 of the lids reduced to a minimum ; but a blackish spot present 



