524 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



are taken both commensally and ferally. It may be that there is a 

 habitat difference for these two kinds of Mastomys at Kulme, but if so 

 the collectors failed to note it. 



Mastomys natalensis ugandae (De Winton) 



Figure 7,o 



Mus ugandae De Winton, Ann. Mag. Nat. Hist., ser. 6, vol. 20, p. 317, September 

 1897. (Entebbe, Uganda.) 



Specimens Examined: Five, all in BM, from: Ukanda, Bahr-el- 

 Ghazal, 1; Meridi, 2; Yei, 2. 



Measurements: An adult, unsexed, from Yei has no external 

 measurements, but the skull measures as follows: Greatest length 33.0 

 condyloincisive length 31.0; length of anterior palatine foramina 8.2 

 crown length of upper toothrow 5.0; least mterorbital width 4.7 

 width of rostrum at level of antorbital foramen 4.1; length of nasals 

 13.9; greatest width across zygomatic arches 15.8. 



Remarks: Since the t3^pe specimen of ugandae is an immature male 

 it is unsuitable for comparison with other types in the species. 

 Topotypes of ugandae which have been available are adult and are 

 generally darker in color than any of the adjacent kinds except 

 macrolepis. 



It is interesting that this subspecies appears to enter the Sudan only 

 where the Ubangi-Uelle Savanna District of the Guinean Savanna 

 Province extends into the Yambio District. 



The skulls of ugandae may be distinguished from those of macrolepis 

 by their smaller size and somewhat larger auditory bullae. 



Praomys albipes fuscirostris (Wagner) 



Figure 7,6 



Mus fuscirostris Wagner, Arch. Naturg., vol. 11, sec. 1, p. 149, 1845. (Sennaar, 

 Anglo-Egyptian Sudan.) 



Specimens Examined: Two, both in BM, from: El Obeid, 1; 

 Kordofan, 1. 



Measurements: The external measm-ements of an adult male from 

 Kordofan are as follows: Length of head and body 120; length of tail 

 95; length of hind foot 37 ; length of ear 15. The cranial measm-ements 

 of an adult female from El Obeid are as follows: Greatest length of 

 skuU 31.5; condyloincisive length 29.8; length of anterior palatine 

 foramina 7.7; cro\vn length of upper toothrow 4.7; least interorbital 

 width 4.0; width of rostrum at level of antorbital foramen 3.9; length 

 of nasals 12.6; greatest width across zygomatic arches 14.9. 



Remarks: These specimens are lighter in dorsal coloration than are 

 specimens of the nominate race from Abyssinia. It seems odd that 



