MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 503 



auditory bullae are somewhat larger, and the rostrum is somewhat 

 heavier. 



Remarks: From the degree of variation as may be noted in the 

 section on comparisons, it is apparent that none of the characters 

 formerly used to separate G. macmillani and G. surdaster are of more 

 than subspecific worth. The characters usually associated with 

 surdaster may be found in the types of macmillani and the converse 

 is also true. I feel, therefore, since these characters are duplicated 

 and do overlap to a great degree, that the animals formerly known as 

 surdaster should now be called macmillani. The names in question 

 are: Grammomys macmillani surdaster, G. m. insignis, G. m. polionops, 

 G. m. littoralis, G. m. callithrix, and G. m. discolor. 



Grammomys macmillani aridulus Thomas and Hinton 



Figure 5,d 



Grammomys aridulus Thomas and Hinton, Proc. Zool. Soc. London, p. 268, July 6, 

 1923. (Kulme, Wadi Aribo.) 



Specimen Examined: The type. 



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

 Length of head and body 115; length of tail 175 ; length of hind foot 24 ; 

 length of ear 18; greatest length of skull 29.4; condylobasal length 

 24.6; zygomatic width 14.3; least interorbital width 4.5; length of 

 nasals 11.0; crown length of upper toothrow 4.3. 



Remarks: G. m. aridulus is the palest of any of the subspecies of 

 this genus occurring in the Sudan. The anterior palatine foramina 

 are shorter than in any of the other kinds. 



Since the type is the only known specimen, it is with some misgiving 

 that I assign it to the species macmillani. However, in all of the 

 characters of the skull and skin there is no one character by which 

 it might be accorded specific rank and by assigning the type to this 

 species probably more nearly expresses the true relationship. 



Grammomys macmillani gazellae (Thomas) 



Figure 5,d 



Thamnomys macmillani gazellae Thomas, Ann. Mag. Nat. Hist., ser. 8, vol. 5> 

 p. 282, March 1910. (Chak Chak, Bahr-el-Ghazal.) 



Specimens Examined: SLx, all in BM, from: Bendele, Yambio 

 District, 1; ''Upper Nile," 1; Tembura, 1; Chak Chak, 2; Loavie, near 

 Fort Berkeley, 1. 



Measurements: The measurements of an adult male paratype 

 from Chak Chak are as follows: Length of head and body 105; length 

 of tail 165; length of hind foot 28; greatest width across zygomatic 



