Genera of Alts fidhisi an MuriJa. 507 



Cyijomys, g. n. 



Size very laifje. Tail iiakcl. Mamma} — 2=t. 



>*^kiill laijLTc, heavy, with will-marked postorbital piocc=!.sp,3 

 distinct fioin and Ixdow thr orilinaiy crown-ridgcs, as in 

 Jljiowj/si and A 'list nil I/. <i. Palatal furaiiiina short. Molars 

 Vi'iv much as in Kpimijs. 



Jiangs. New Guinea. 



Type. Ci/roini/.t iniptrator (.I/-/.? impcrator^ Thos.). Other 

 species C rex. 



A full account of tlio peculiarities of both sjipcies and 

 fij^ures of their skulls were ;4iveu in 1888 *; and from these it 

 may be readily seen how distinct these <i;iant rats are from the 

 ordinary Kjtinii/n. They would seem to have some distant 

 relationship to the otiier larf;o Australasian murines Uyonnjs 

 and Anii!oini/.i, though the structure of tho molars is less 

 peculiar. 



Stl:nomvs, g. n. 



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

 about as in JCpimys or rather less hairy. Foet slender, the 

 nii'tatarsus ."omewhat len<ithened. Clitoris rather lon^i;. 

 lyiammie (of type species) 1 — 2 = 6. 



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

 muzzle. Interorbital edges square, the beads scarcely j)er- 

 ccptilde. Interparietal faiily large. Palatal loraniiua 

 medium or small. Bulhc lather small. 



Incisors rather more Hattened in front than \n Epimys, 

 T>Iolars as in that genus; lu"^ without antcro-external cusp 

 (cu<p W). 



Rtiit/e. New Guinea. 



I ype. l^ttiiomys verfcundnit [}rns vert'cundwi, Thos. f). 

 Oilier species «S'. uiube [Man uiuba, Thos.). 



The typical species of this genus was only put with great 

 doui)t into Mus whon 1 Hrst desciibed it, and 1 aui now con- 

 vinced it should not be assigned to the re-«tricted Kpimys. 

 lis most distinctive characters are its slender feet and tlie 

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

 ordinary rats. 



a. niobe quite agrees in these respects with S. verccundus^ 

 but its mammary formula is as yet unknown. 



♦ P. Z. S. 1H88, p. 47!), j.I. xxii. 

 t Nov. Zoul. \i. p. 698 ^1UU4;. 



;5i^ 



