﻿NO. 1 6 NEW RODENTS FROM AFRICA HELLER 1 3 



foramina, 6.7 ; diastema, 9.8 ; maxillary toothrow, 7 ; condylo-incis- 

 ive length of mandible, 22.6; coronoid-angular depth of mandible, 

 12.6. 



It is surprising to find a form with so conspicuous a dorsal stripe 

 living at the northern extremity of the range of the genus, with the 

 intermediate geographical form unstriped. 



A large series is in the collection from the summits of the Taita 

 Mountains, and a few also from the base of the range where they 

 are much rarer. 



PELOMYS FALLAX CONCOLOR, new subspecies 

 Uganda Creek Rat 



Type from Kiduha, Lake Mutanda, Uganda ; adult male ; num- 

 ber 1 1. 12. 3. 344, Brit. Mus.; collected June 25, 191 1, by Robin 

 Kemp; original number, 2307. 



Characters. — Resembling insignatus in lacking a dark dorsal 

 stripe, but differs in more uniform and darker coloration to under 

 surfaces, in narrower nasals, and longer toothrow and palatal fora- 

 mina. From iridescens it differs in lack of the dorsal stripe, in the 

 absence of white on throat and belly, and also in the narrower inter- 

 orbital constriction, larger palatal foramina and bullae, and shorter 

 tail. 



Coloration.- — Dorsal area bister, with some black lining, the bister 

 gradually brightening on head and sides of body to golden-olive, 

 with but little black lining ; ears blackish, the long hairs at the base 

 rusty ; feet tawny-olive, like the underparts ; underparts uniformly 

 tawny-olive, and scarcely lighter than the golden-olive of the sides, 

 the hair plumbeous at base; tail sharply bicolor, black above, tawny- 

 olive below. 



Measurements. — Head and body, 146 mm.; tail, 137; hind foot, 

 29.5; ear, 18. Skull: greatest length, 36; condylo-incisive length, 

 33; basilar length, 29; zygomatic breadth, 17.3; interorbital con- 

 striction, 5.8; nasals, 14 x 4.5; palatilar length, 15.7; diastema, 9; 

 palatal foramina, 7.3 ; maxillary toothrow, 7 ; condylo-incisive 

 length of mandible, 22 ; coronoid-angular depth of mandible, 12. 



This species is closely related to the unstriped form insignatus 

 of Nyasaland, and not closely to the Taita form which is an 

 isolated mountain species. A large series of specimens is in the Brit- 

 ish Museum from Uganda, and Lake Kivu on the western frontier of 

 German East Africa. These specimens agree well in their uni- 



