MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 529 



base of the tail; entire underparts, subauricular spots, and dorsal 

 surfaces of hands and feet pure white. Skull small, upper toothrow 

 short, auditory bullae but moderately inflated, anterior palatine 

 foramina relatively long, rostrum relatively short and broad, inter- 

 pterygoid space broadly V-shaped, interorbital region relatively wide. 



Measurements op the Type Specimen: Length of head and body 

 51 ; length of tail 36; length of hind foot 11.5; length of ear 9; greatest 

 length of skull 16.1; condyloincisive length 14.9; length of anterior 

 palatine foramina 3.5; crown length of upper toothi'ow 2.9; least 

 interorbital width 3.1 ; width of rostrum at level of antorbital foramen 

 2.2; length of nasals 6.2; greatest width across zygomatic arches 8.5. 



CoiMPARisoNs: From M. b. gondokorae, M. b. delamensis may be 

 distinguished by its markedly lighter color and smaller size. Skull 

 smaller in all measurements except crown length of upper toothrow 

 and length of nasals, anterior palatine foramina smaller, auditory 

 bullae less inflated, and rostrum narrower. 



M. b. delamensis may be distinguished from M. b. enclavae by its 

 markedly lighter color and smaller size. The skull is markedly 

 smaller in all dimensions but the auditory bullae are equally inflated, 

 thus creating the impression of larger bullae in delamensis. 



M. b. aequatorius differs from M. b. delamensis in darker color ard 

 more pronounced subauricular and postauricular spots and generally 

 larger size. The skull is wider across the zygomatic arches, the audi- 

 tory bullae are more inflated, and the braincase is larger. 



Reiv arks: The above comparisons of pelages were, so far as pos- 

 sible, made on animals taken during the same mon th. As may be noted 

 under the remarks section of M. b. aequatorius, there is a seasonal 

 difference in pelage color. 



Specimens in the British Museum from the Jebel Marra may be 

 referable to Mus bellus, but since no skulls are available I prefer not 

 to list them. The skins are more nearly like M. b. delamensis than 

 any of the other kinds but it would seem improbable that the Jebel 

 Marra animals would be the same. 



Mus bellus gondokorae Heller 



Figure 7,c 



Mus bellus gondokorae Heller, Smithsonian Misc. Coll., vol. 56, No. 17, p. 8, 

 February 28, 1911. (Gondokoro.) 



Specimens Examined: Seventeen, from: Gondokoro, 3 (1, BM); 

 Malek, 9 (BM); MongaUa, 2 (BM); Juba, 1 (BM); Kenisa, 1 (BM); 

 Bahr-el-Ghazal, 1 (BM). 



Measurements: The type, an adult male, measures as follows: 

 Length of head and body 60; length of tail 43; length of hind foot 13; 



