502 PROCEEDINGS OF THE NATIONAL MUSEUM vor,. i06 



1 ; Ngaboli, 47 miles north of Torit, 1 (IVf CZ) ; Ngabara, near Ohio, 1 

 (MCZ) ; Talanga Forest, Imatong Mountains, 1 (MCZ) ; Gilo, Imatong 

 Mountains, 1 (MCZ). 



Diagnosis: Upperparts of mixed coloration; anteriorly grayish 

 brown with some admixture of Sayal Brown gradually shading at about 

 the middle of the back into primarily Sayal Brown intermixed with 

 black-tipped hairs, thus presenting a "2-toned" appearance; color of 

 anterior and posterior parts of the dorsum shading over the sides into 

 a neutral grayish color which is bordered ventrally by a thin line of 

 Pinkish Buff extending from the forearm along the sides and over the 

 flanks onto the lower leg. Upper lips, under side of forelegs, under 

 parts of thighs and entire belly pure white; tail brownish and indis- 

 tinctly bicolor. Skull relatively large and robust; dorsal outline 

 relatively flat, rostrum short and broad, anterior palatine foramina 

 relatively short, and auditory bullae relatively large. 



Measurements of the Type Specimen: Length of head and body 

 107 ; length of tail 180 ; length of hind foot 25 ; length of ear 20 ; greatest 

 length of skull 29.3; condylobasal length 24.5; least interorbital width 

 4.5; length of nasals 10.4; crown length of upper toothrow 4.4. 



Comparisons: G. m. erythropygus is in color like G. s. elgonis, but 

 the skull is flatter, the upper cheek teeth are wider, the auditory bullae 

 are somewhat larger, anterior palatine foramina are shorter, and the 

 basioccipital is narrower. 



The present-named form is like the type and a paratype of G. m. 

 gazellae in color but the skull is larger in all measurements taken 

 except for the length of the anterior palatine foramma, which are 

 shorter. 



G. m. erythropygus differs from the type of G. macmillani in that the 

 color is less intense and does not extend so far forward on the body. 

 The skull of the former is larger, the anterior palatine foramina are 

 longer, the posterior choanae are wider and longer, the auditory bullae 

 are larger, and the palate is somewhat wider. 



From the type of G. surdaster, G. m. erythropygus differs in less 

 intense color, the skull is flatter in dorsal outline, the auditory bullae 

 are somewhat larger, the anterior palatine foramina are narrower 

 and longer, and the rostrum is somewhat heavier. 



The color of G. m. aridulus is decidedl}^ paler than is G. m. erythro- 

 pygus. The skull is about the same size but aridulus has the anterior 

 palatine foramina somewhat shorter and the zygomatic arches are 

 somewhat heavier. 



From a paratype of G. s. polionops the present subspecies differs in 

 a lighter color throughout. The skulls are larger, the anterior palatine 

 foramina longer, the posterior choanae wider, the palate is wider, the 



