552 On new Mammals from British East Africa. 



Skull similar in general appearance to that of Muriculus, 

 but very much larger and more heavily built. Pterygoid 

 region quite unlike both that of Muriculus and Lophuromys, 

 a well-defined A-shaped ridge extending from the posterior 

 end of the palate to the anterior ends of the auditory bullae. 

 Incisors large and heavy, thrown forwards even more than 

 in the case of Muriculus. Lower jaw similar in shape to 

 that of Muriculus ; incisors extending back into the posterior 

 part of the mandible, to form a prominent excrescence close 

 to the condyle. 



Type. Uranomys ruddi. 



The unique arrangement of the pterygoid region necessi- 

 tates this species being regarded as forming a distinct genus. 

 The skin-characters would appear to indicate a close re- 

 lationship with the ^e\\Vi%Lophiiromys, but, on account of the 

 general structure of the skull, this new form must be 

 considered as more nearly allied to Muriculus. 



Uranomys ruddi, sp. n. 



General appearance very much that of a light-coloured 

 Lophui'omys. 



Feet and ears rather small, tail a little longer than that 

 oi Lophuromys aquihis, True. Hair on back harsh and long, 

 measuring about 17 mm. in length on rump. General 

 colour of back greyish brown (warm sepia no. 1, ' Repertoire 

 de Couleurs ^), paling to a huffy tint (between dark fawn 

 no. 2 and yellowish salmon no. 3, ' Repertoire ') on the sides 

 and upper surface of limbs. Individual hairs of back slaty 

 grey at base, tips dark brown, subterminal ring orange-buff. 

 Nasal region and top of head rather darker than back. 

 Sides of face pale buff. Upper surface of hands and feet 

 white. Under surface of body white, washed over with 

 pinkish buff (pale flesh no. 1, * Repertoire \). • Tail thinly 

 covered with short, rather stiff, grey hairs. 



f^kull strongly built. Cranial region large and rather 

 elongate, almost pear-shaped. Masals bi'oad and very short, 

 the premaxillary region projecting for about 3 mm. in front 

 of their anterior ends. Occipital region well developed. 

 Palatal foramina very long, extending back posteriorly as far 

 as the middle of the first molar. Auditory bullae rather 

 small and flat. Molar series small, evidently murine in 

 character, but the teeth are too worn to make out ihe cusps. 

 Palate, pterygoids, and incisors as described above. 



Dimensions of the type (measured in the flesh) ; — 



Head and body 118 mm. ; tail 77; hind foot 19 ; ear 15. 



Skull; greatest length 30"4; condylo-basal length 28'o j 



