MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 517 



Aethomys kaiseri helleri (Hollister) 



Figure 6,d 



Epimys kaiseri centralis Hollister, Smithsonian Misc. Coll., vol. 63, No. 7, p. 10, 



June 1914. (Rhino Camp.) 

 Rattus helleri Hollister, Proc. Biol. Soc. Washington, vol. 31, p. 97, June 29, 1918. 



(New name to replace E. k. centralis, preoccupied by Mus auricomis centralis 



Schwann, 1906.) 



Specimens Examined: Twenty, from: Moli, 35 miles north of 

 Nimule, 3 (MCZ) ; Nimule, 5 (4, MCZ) ; Magwe, 36 miles southwest of 

 Torit, 2 (MCZ); Katire, 1 (MCZ); Torit, 5 (1, MCZ); Jiiba, 1; 

 Nadiopgi, 2; Lokwi, 25 miles south of Torit, 1. 



Measurements: An adult male and an adult female from Torit 

 measure, respectively, as follows: Length of head and body 163, 165; 

 length of tail 135, 150; length of hind foot 30, 32; length of ear 14, 

 18; greatest length of skull 39.7, 40.3; condyloincisive length 36.8, 

 36.7; length of nasals 16.2, 17.2; least interorbital width 5.9, 5.8; 

 width of rostrum at level of antorbital foramen 5.2, 5.1 ; greatest width 

 across zygomatic arches 19.4, 18.8; crown length of upper toothrow 

 5.9, 6.1; length of anterior palatine foramina 8.8, 9.3. 



Remarks: In general these animals are quite variable in any one 

 given character. This is especially so m the size of the upper molars, 

 but even in this character these specimens are consistently larger 

 than in the type of A. k. helleri. There are, however, some specimens 

 in the type series of helleri that have the molars as large as and even 

 somewhat larger than any in the present material. 



There are other characters of the pelage color and cranium that 

 are divergent from the type and type series of helleri. These diver- 

 gences, though, are of such minute amount that it is not deemed ad- 

 visable to erect a separate name for this population. It seems as 

 though here is an example where subspeciation is occurring but that 

 the characters have not become stable enough to warrant complete 

 recognition. 



Mastomys kulmei, new species 



Figure 6,d 



Type: BM No. 23.1.1.403, adult male, skin and skull, from Kulme, 

 Wadi Aribo, 3,300 feet, Darfm- Provmce, Anglo-Egyptian Sudan- 

 Obtained September 15, 1921, by Lynes and Lowe, original No. 912. 



Specimens Examined: Eighty-two, all in BM, from: Kulme, Wadi 

 Aribo, 28; Niurmya, 5; 6 miles west of El Fasher, 1; 52 miles west- 

 southwest of El Fasher, 2; 35 miles west-southwest of El Fasher, 2; 



