GIO OLDFIELD THOMAS 



Leptoniys, g. n. (Ilydromi/inae). 



Form murine ; eyes small. Tail rather short. Hind-feet long. 

 Mammae — 2 =: 4. 



Skull long, narrow and low. Anteorbital foramina scarcely 

 broader above than below. 



Molars strictly Ilydromyine in structure, but Va in number. 



IG. Leptomys elegans, sp. n. 



Yery similar in size and general appearance to Uromys levipes. 

 Fur close, soft and velvety. General colour rufous fawn, browner 

 on the back, especially anteriorly; shoulders, flanks and hips 

 bright rufous. Face darker; upperside of muzzle black, exten- 

 ding backwards to form an indistinct ring round the eyes. 

 Ears rather small, naked, blackish. Upper lips, lower part of 

 cheeks, inner side of arms, and whole of undersurface from 

 chin to anus creamy white, the hairs white to their bases. 

 Upper surface of hands and feet thinly haired, white; pollex. 

 with a small nail; fifth hind toe reaching only to the base of 

 the fourth. Tail little longer than tlie body without the head , 

 very finely scaled (15 or 16 to the centimetre) thinly hairy, 

 its basal three-fourths brown above, whiter below, its tip 

 whitish all round. 



Skull long and low, the cranial part but little higher than 

 the muzzle ; zygomata slender, not widely expanded. Supraorbital 

 edges parallel, not ridged. Bullae small. 



Incisors broad, flattened in front, pale yellow with the tips 

 white, both above and belo^v. Molars typically hydromyine in 

 structure; m^ well developed both above and below. 



Dimensions of the type , an adult female , measured on the 

 spirit specimen before skinning : 



Head and body 1G2 mm.; tail lo4; hind-foot 40; ear 20. 



Skull, basal length 36.3; basilar length 33; greatest breadth 

 18.5 ; nasals 14.6 X 4.9 ; interorbital breadth 6.1 ; interparietal 

 5.4 X 9; brain-case, breadth 15.1; anterior zygoma-root 2.5; 

 height of anteorbital foramen 3.9 ; distance between outer cor- 

 ners of the two foramina 9.8; palate length from henselion 17.8; 

 diastema 10.4; palatine foramina 5.7 X 3.2; hinder end of fora- 



