Mammals from Ceram. 425 



Size about as in rufescens. Fur thick, hairs of back about 

 15 mm. in length. General colour above rnfescent brown, 

 the head greyer. Under surface soiled greyish white, occa- 

 sionally washed with yellowish, the hairs broadly slaty at 

 base. Ears brown. Hands and feet whitish. Tail little or 

 not longer than head and body, dark brown, little hairy. 

 Mammaa 2—3 = 10 or 3—3 = 12. 



Skull as compared with specimens of the same group from 

 Wabaii in the lowlands, collected by W. Stalker, of about 

 the same size, the nasals longer and more attenuated, supra- 

 orbital ridges lighter, and more broad outwards on the 

 parietals; choanal openings wider ; projection forward of 

 zygomatic plate less. Molars comparatively small and light. 



Dimensions of the type : — 



Head and body 160 mm. ; tail 165 ; hind foot 37 ; 

 ear 22. 



Skull : greatest length 42 ; condylo-incisive length 39 ; 

 zygomatic breadth 20 ; nasals 16*6 ; interorbital breadth 6'3 ; 

 breadth between ridges on parietals 15*7; palatilar length 19"6; 

 palatal foramina 7*9; breadth of choanas 3'4 ; upper molar 

 series 7. 



Hob. as above. 



Type. Adult male. B.M. no. 20. 7. 26. 13. Original num- 

 ber 20. Collected December 1919. 



A member of the common widely spread Rattus rattus or 

 liattus rufescens group. Two specimens of the same group 

 obtained by Mr. Stalker in the lowlands of Ceram have much 

 shorter or coarser fur, more whitish underside, and in the 

 skull are distinguishable by the details above mentioned. 

 Apparently, therefore, the Manusela rat is a modified mountain 

 form which may be given a special name. 



6. Rattus sp. — R. concolor group. 



$. 27. Mt. Manusela. 4600'. 



$ in formalin. 6000'. 



The local member of the small widely spread Oriental and 

 Australasian group to which R. concolor, browni, maorium, 

 exulans, and others belong. Characterized by small size and 

 2 — 2 = 8 mammae. Not determinable more exactly at present. 



7. Stenomys ceramicus, sp. n. 



cJ; 13,16; $.30. Mt. Manusela. 6000'. 

 " Trapped in heavy jungle." 



Smaller than S. verecundus, larger than *S'. niobe and klossi. 

 Palate unusually produced backwards. 



