MALIMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 527 



Praomys tullbergi sudanensis, new subspecies 



Type: CNHM No. 67268, adult male, skin and skull, from Lotti 

 Forest, Torit District, Anglo-Egyptian Sudan. Obtained April 7, 

 1950, by Harry Hoogstraal, original No. 5438. 



Specimens Examined: Twenty-one, from: Gilo, Tmatong Moun- 

 tains, 16 (12, MCZ); Opari, 30 miles north-northeast of Nimule, 1 

 (MCZ) ; Lotti Forest, 2 ; Imowa, Didinga Mountains, 1 (BM) ; Talanga 

 Forest, 1 (BM). 



Diagnosis: Upperparts near Antique Brown which terminates 

 abruptly on the sides, flanks, and shoulders in the plumbeous-based, 

 white-tipped hairs of the entire underparts, including the chin, throat, 

 and undersides of forelimbs and hindlimbs. Tail longer than head 

 and body and the hands and feet white with traces of the dorsal color 

 extending on the proximal portions of the first metatarsals and meta- 

 carpals. Entire underparts with hairs white-tipped but plumbeous 

 at base. Skull with but slightly developed supraorbital ridges; 

 zygomatic arches relatively heavy; nasals short; anterior palatine 

 foramina relatively short; braincase relatively flat; auditory bullae 

 relatively large. 



Measurements of the Type Specimen: Length of head and body 

 121; length of tail 149; length of hind foot 25; length of ear 21; con- 

 dyloincisive length of skull 29.2; greatest width across zygomatic 

 arches 15.6; least interorbital width 5.0; length of nasals 11.5; crown 

 length of upper toothrow 4.7; length of anterior palatine foramina 

 7.0; width of rostrum at level of antorbital foramen 3.7. 



Comparisons: From the type and type series of Praomys tullbergi 

 peromyscus, P. t. sudanensis differs in lighter color throughout, belly 

 hairs without huffy wash, tail more finely annulated, anterior palatine 

 foramina shorter, auditory bidlae larger, pterygoid wings more flared 

 laterally, nasals shorter, least interorbital width greater, and brain- 

 case flatter. 



Praomys tullbergi sudanensis differs from P. t. jacksoni as known 

 from specimens from Kaimosi, British East Africa, in generaUy 

 brighter color dorsally. The skull differs in that the upper cheekteeth 

 are smaller, auditory buUae larger, width across zygomatic arches 

 greater, rostrum wider and shorter, anterior palatine foramina shorter, 

 nasals shorter, and the braincase is flatter. 



Remarks: The type specimen of P. t. jacksoni from Entebbe, 

 Uganda, is so young that it is worthless for comparative purposes. 

 Therefore, the specimens referred to jacksoni from Kaimosi have been 

 used instead. 



386559— 5C 



