210 Mr. 0. Thomas on new 



which may possibly be one or other of the species now 

 described, I regret that no exact determination of it seems to 

 be possible. It was based on a young specimen with the 

 third molar barely erupted, so that, even with topotypes, it 

 will probably always be difficult to be certain of its identifi- 

 cation, since several species may occur in near neighbourhood 

 to one another. All the species of this group have the 

 multiplicate character of the palate, which seems to have been 

 the chief reason for Dr. Jentink's venturing to describe so 

 young a specimen. 



Of the smaller forms of Uromys the Expedition obtained 

 55 specimens, apparently referable to four different species, 

 as follows : — 



1. Size rather small. Tail wholly black. Belly-hairs white to their 

 bases U. stalkeri calidior, Thos. 



At Launch and Canoe Camps ; Setakwa River. Sea-level to 150 ft. 



2. Size larger. Tail conspicuously bicolor. Belly-hairs mouse-grey 

 at base U. Ivrentzi, Jent. 



At same camps as No. 1. 



Closely related to U. levipes, Thos. 



3. Size smaller. Tail partially and indistinctly bicolor, with dull 

 yellowish markings on its under side. Belly hairs slaty basally. 



U. platyops, Thos. 

 At Camp No. 3 above the Utakwa River. Alt. 2500'. 



4. Size fairly large. Tail as in No. 3. Fur long, soft, and woolly. 

 Under surface dull buffy, with long slaty-grey bases. 



U. mollis, sp. n. 

 At Camps Nos. 6 c and 9, Upper Utakwa River. Both at altitude 

 5500 ft. 



In addition, there should apparently occur a species like 

 No. 1, but larger, which was described from the Noord River 

 as Pogonomys leucogaster by Jentink. This is evidently 

 closely allied to Peters's U. bruijnii from Salawatti. 



Uromys mollis, sp. n. 



Size rather less than in U. lorentzi. General characters 

 very much as in No. 3 above, but the fur longer, softer, and 

 woollier, the colour all over duller and more "saturate," that 

 of the belly less sharply defined laterally, more suffused with 

 buffy, and with the slaty bases much longer. Feet dull 

 buffy. 



Skull with a more rounded convex brain-case than in other 

 species. Interorbital region broad, little ridged. 



Dimensions of the type (measured in flesh) : — 



Head and body 161 mm. ; tail 140 ; hind foot 34 ; 

 ear 21. 



