512 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



this apparent lack of differentiation must await further specimens 

 from intermediate localities or until a revision is done on the genus 

 as a whole. 



.Lemniscomys dunni dunnt (Thomas) 



Figure 6,c 



Arvicanihis dunni Thomas, Proc. Zool. Soc. London, p. 297, Aug. 6, 1903. (Kaga 

 Hills, western Kordofan.) 



Specimens Examined: Eleven, all in BM, from: Umm Keddada, 3; 

 El Fasher, 2; Juga Juga, 15 miles east-northeast ofElFasher, 1 ; 76 miles 

 east of El Fasher, 1; 110 miles east of El Fasher, 1; Kurra, Jebel 

 Marra, 3. 



Measurements: An adult female from Juga Juga and an adult 

 male from 76 miles east of El Fasher measure, respectively, as follows: 

 Length of head and body 116, 108; length of tail 142, 130; length of 

 hind foot 27, 25; length of ear 15, 16; greatest length of skull 30.1, 

 30.1; condyloincisive length 26.9, 26.7; length of auditory bullae 5.7, 

 6.2; crown length of upper toothrow 5.0, 5.3; least interorbital width 

 4.5, 4.8; breadth of rostrum at level of antorbital foramen 3.7, 3.4; 

 length of nasals 11.7, 11.8. 



Remarks: The species dunni differs from L. barbarus in markedly 

 lighter color, shorter anterior palatine foramina, markedly different 

 shape of the posterior choanae, and the general structure of the ptery- 

 goid region. The auditory bullae are smaller, the toothrow somewhat 

 longer, anterior parts of the zygomatic arches tapering into skull 

 instead of flaring outward, and the braincase is more extended posterior 

 to the posterior root of the zygoma. 



There are three specimens in the British Museum without skulls 

 from Kurra, Jebel Marra, that either represent a new species or are 

 hybrids between L. dunni and L. lynesi. From the appearance of the 

 skins they are intermediate in all details. I feel it best to record these 

 specimens and only refer them to L. dunni provisionally. 



Lemniscomys dunni nubalis Thomas and Hinton 



Figure 6,c 



Lemniscomys dunni nuhalis Thomas and Hinton, Proc. Zool. Soc. London, p. 263, 

 July 6, 1923. (Talodi, Nuba Country, southern Kordofan.) 



Specimens Examined: Slx, all in BM, from: Talodi, 2; Nuba 

 Mountains, 1 ; Delami, 1 ; Agur, 2. 



Measurements: An adult male from the Nuba Mountains and an 

 adult female from Talodi measure, respectively, as follows: Length of 

 head and body 95, 90; length of tail 115, 112; length of hind foot 23, 

 22; length of ear 13, 13; greatest length of skidl 28.4, ?; condyloincisive 



