On new Mammals from the Trengganu Archipelago. 115 



Rhipidomys hicullus, sp. n. 



A large species, with grey-based belly-hairs and broad 

 palate. 



General external appearance very much as in Rh. leuco- 

 dacti/Ius, Tschudi, to which I refer specimens from Marcapata 

 and Ocabamba. But while the belly-hairs of leucodactylus 

 are grey-based laterally and wholly white down the centre of 

 the belly, in hicullus they are grey-based throughout. Tail 

 more heavily haired than in leucodactylus, the hairs of the 

 terminal tuft attaining 15-17 mm. in length. Feet coloured 

 as in leucodactylus. 



Skull with rather larger brain-case than in leucodactylus. 

 Nasals very narrow. Supraorbital space narrow, its edges 

 nearly parallel, with faintly indicated postorbital projections. 

 Palate broader than in leucodactylus, especially behind, the 

 two molar series almost diverging posteriorly, and the breadth 

 across the narrowest point on the bone behind the molars at 

 the anterior base of the pterygoids conspicuously greater ; 

 the mesopterygoid fossa also broader. 



Dimensions of the type (measured in the flesh by the 

 collector) : — 



Head and body ISO mm.; tail 220 ; hind foot 31. 



Skull: greatest length 41*5; basilar length 33; zygo- 

 matic breadth 23*3 ; nasals 8'2 x 4'5 ; interorbital breadth 5"7 ; 

 breadth of brain-case 17*3; palatilar length 17*5; diastema 

 11; palatal foramina 8'3 ; breadth between outer sides of 

 m^ 8'7; outside breadth across necks of pterygoids 7*1; 

 breadth of mesopterygoid fossa 3*4 ; upper molar series 6*8. 



Hah. Garita del Sol, Valley of Vitoc, Upper Fereiie, Central 

 Peru. Alt. 5700'. 



Type. Adult female. B.M. no. 94. 10. 1. 11. Collected 

 by J. Kalinowski, 5th July, 1891. Received in exchange 

 from the Branicki Museum. 



Readily distinguishable by the grey -based belly-hairs and 

 he various cranial characters described. 



XII. — Diagnoses of new Mammals from the Trengganu Archi- 

 2)elago, East Coast of the Malay Peninsula. By C. BoDEN 

 Kloss. 



The following are diagnoses of new mammals obtained by 

 Mr. C. Boden Kloss in the Redang, Perhentian, and other 

 small islands off the coast of Trengganu. Full descriptions, 



8* 



