528 PROCEEDINGS OF THE NATIONAL MUSEUM tol. loa 



The reddisli brown color of these auimals is characteristic of the 

 fully adult pelage. The juveniles and subadults are a much darker 

 plumbeous color with some admixture of brownish hairs. The change 

 from subadult to adult pelage apparently commences on the sides and 

 works dorsally to meet in the middorsal line. Several specimens in 

 the above series show this transitional pelage. 



Mus bellus aequatorius Setzer 



Figure 7,c 



Mus bellus aequatorius Setzer, Journ. Washington Acad. Sci., vol. 43, No. 10, 

 p. 335, October 22, 1953. (Torit.) 



Specimens Examined: Forty-eight, from: Torit, 43 (14, MCZ); 

 Ikoto, 1; Obbo, 1; Loa, 1; Magwe, 1 (MCZ); Nimule, 1 (MCZ). 



Measurements: Even though a large series has been available for 

 study, the type is the only specimen that approaches completeness in 

 the skull. Owing to an error the external measurements as given in 

 the original description are wrong. The correct measurements are 

 as follows: Length of head and body 54; length of tail 37 (not 32); 

 length of hind foot 12 (not 11) ; length of ear from notch 7; condyloin- 

 cisive length of skull 15.9; crown length of upper toothrow 2.8; 

 greatest width across zygomatic arches 8.8; least interorbital width 

 3.1; length of nasals 6.2; width of rostrum at level of antorbital 

 foramen 2.2. 



Remarks: Specimens of this small mouse taken duiing the months 

 of April through July show a marked darkening of the pelage and lack 

 almost entirely the white postauricular and subauricular spots that 

 are so characteristic of this subspecies in the pelage in the months 

 from November through February. Regardless of the pelage color, 

 this subspecies may be distinguished from the contiguous subspecies 

 in eastern Africa by the shorter toothrow and narrower rostrum. 



This mouse appears to have open savanna as its primary habitat. 

 A few specimens, however, were taken in buildings in Torit. 



Mus bellus delamensis, new subspecies 



Figure 7,c 



Type: BM No. 28.3.11.61, adult male, skin and skull, from Delami, 

 Nuba Mountain Province, Anglo-Egyptian Sudan. Obtained June 3, 

 1927, by W. Ruttledge, original No. 387. 



Specimens Examined: Eleven, all in BM, from: Delami, 9; Agur, 

 1; Jebel Kadaro, 1. 



Diagnosis: Upperparts near Cinnamon-Buff, purest on sides, 

 flanks, and cheeks; middorsal area strongly intermixed with black 

 hairs, thus presenting a rather marked stripe from^the^nosejto the 



