new Mammals from South America. 143 



no. 9 "), the bases of the hairs slaty, the tips white. Line of 

 demarcation on sides fairly well defined. Head like body ; 

 muzzle rather darker, with dark rims round the eyes. Ears 

 rather large, thinly haired, greyish brown. Outer surface of 

 arms and legs drab-grey ; hands and feet pure white. Tail 

 approximately cqmil in length to the head and body, very 

 finely scaled, practically naked ; greyish brown, rather paler 

 for its proximal third below. 



Skull closely similar in size and shape to that of 0. inter- 

 medins, therefore decidedly larger than in 0. laticeps; the 

 palatal foramina are, however, rather shorter than in the 

 former, though not so short as in the latter, and are more 

 widely open. The supraorbital edges are squared or finely 

 beaded, but are without overhanging ledges. 



Dimensions of the type (measured in the flesh) : — 



Head and body 140 ram. ; tail 145 ; hind foot, s. u. 3L 

 (range 30-33), c. u. 33 ; ear 21. 



Skull: greatest length 36*3; basilar length 28; greatest 

 breadth 18 - 5; nasals 13'7 ; interorbital breadth 5'6 ; palate 

 length 15"6; palatal foramina 5' 1x26; length of upper 

 molar series 5. 



Nab. S. Lourenco, near Pernambuco. Alt. 50 m. 



Type. Adult male. B.M. no. 3. 10. 1. 42. Original 

 number 1573. Collected 23rd July, 1903, by Alphonse 

 Robert. Eight specimens. 



This Oryzomys is readily distinguished from any species 

 hitherto known. In its colour it is remarkably like some of 

 the forms of the O. laticeps group, but is separable from 

 them by its much larger skull and longer palatine foramina. 

 In some of the specimens the darker dorsal area is so marked 

 as to suggest an affinity with O. sublineatus, Thos., but the 

 hind tVet in that species are conspicuously shorter. 



From O. physodes, Licht. (Rio Janeiro and Espirito Santo), 

 O. lamia, Thos. (Minas Geraes), and O. intermedins, Leche 

 (Sao Paulo to Rio Grande do Sul), of all of which Mr. Robert 

 has obtained specimens, this species in distinguishable by 

 the absence of the rufous or buffy body-colour found in those 

 animals. 



Marmosa germana, sp. n. 



A large species of the cinerea group, with a wholly brown 

 tail. 



Fur thick, close, and wavy; hairs of back about 10-11 mm. 

 in length. General colour above pale brown, rather paler 

 than "mummy-brown," rather less yellow than "raw 

 umber " of Ridgway. Under surface soiled buffy greyish, 



