Genera of Australasian Muridse. 507 



Cyromys, g. n. 



Size very large. Tail naked. Mammas — 2 = 1. 



Skull large, heavy, with well-marked postorbital processes 

 distinct from and below the ordinary crown-ridges, as in 

 1/yoniys and Anisomys. Palatal foramina short. Molars 

 very much as in Epimys. 



Rang",. New Guinea. 



Type. Cyromys imperator (Mas imperator, Thos.). Other 

 species C. rex. 



A full account of the peculiarities of both species and 

 figures of their skulls were given in 1888 * ; and from these it 

 may be readily seen how distinct these giant rats are from the 

 ordinary Epimys. They would seem to have some distant 

 relationship to the other large Australasian murines Hyomys 

 and Anisomys, though the structure of the molars is less 

 peculiar. 



Stenomys, g. n. 



Size medium or small. Tail slender, of medium hairiness, 

 about as in Epimys or rather less hairy. Feet slender, the 

 metatarsus somewhat lengthened. Clitoris rather long. 

 Mammae (of type species) 1 — 2 = Q. 



Skull scarcely ridged, low, smooth, with a long narrow 

 muzzle. Interorbital edges square, the beads scarcely per- 

 ceptible. Interparietal fairly large. Palatal foramina 

 medium or small. Bulhe rather small. 



Incisors rather more flattened in front than in Epimys. 

 Molars as in that genus; m 2 without antero-external cusp 

 (cusp 3). 



Range. New Guinea. 



Type, bttnomys verecundus [Mas vereeundus, Thos. f). 

 Other species 8. niobe (Mus m'o^e, Thos.). 



The typical species of this genus was only put with great 

 doubt into Mus when I first desciibed it, and 1 am now con- 

 vinced it should not be assigned to the restricted Epimys. 

 Its most distinctive characters are its slender feet and the 

 long smooth muzzle of its skull, which is quite unlike that of 

 ordinary rats. 



S. niobe quite agrees in these respects with S. verecundus, 

 but its mammary formula is as yet unknown. 



* P. Z. S. 1888, p. 479, pi. xxii. 

 t Nov. Zool. xi. p. 598 (.1904). 



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