MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 485 



Remarks: When compared to Gerbillus watersi, G. mackilligini is 

 larger and much darker in color and with the tail brush well developed. 

 The extent of the white areas has been markedly reduced. The 

 skull is larger, the molars are markedly larger, and the pterygoid 

 fossae are relativelj^ closed as opposed to quite open in the latter. 

 The auditory bullae are relatively, as well as actually, longer and more 

 inflated. The infraorbital foramina are smaller. 



Gerbillus {Dipodillits) tnurtculiis (Thomas and Hinton) 



Figure 4,d 



Dipodillus muriculus Thomas and Hinton, Proc. Zool. Soc. London, p. 263, July 6, 

 1923. (Madu, 80 miles northeast of El Fasher.) 



Specimens Examined: Two, both in BM, from: Madu, 80 miles 

 northeast of El Fasher, 1 ; 90 miles northeast of El Fasher, 1. 



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

 Length of head and body 65; length of tail 82; length of hind foot 18; 

 length of ear 12; greatest length of skull 23.0; condyloincisive length 

 19.7; length of anterior palatine foramina 3.6; crown length of upper 

 toothrow 3.2; length of auditory bullae 7.8; least interorbital width 

 4.2; length of nasals 8.9; width of rostrum at level of antorbital fora- 

 men 2.3; greatest mdth across zygomatic arches 11.8. 



Remarks: Gerbillus muriculus, when compared to G. principulus, 

 is smaller and more reddish in color. The dorsal color is carried onto 

 the dorsal surface of the tail in the former and not in the latter. 

 The skull is markedly smaller but the anterior palatine foramina are 

 of the same size. The upper cheekteeth and the auditory bullae are 

 markedly smaller. 



The tail appears to have been broken in the type since a paratype 

 has the tail measuring 115 mm. 



Gerbillus (Dipodillus) principulus (Thomas and Hinton) 



Figure 4,d 



Dipodillus principulus Thomas and Hinton, Proc. Zool. Soc. London, p. 262, .July 

 6, 1923. (El Malha, Jebel Meidob, Northern Darfur.) 



Specimen Examined: The type. 



Measurements: The tj^pe, an adult female, measures as follows: 

 Length of head and body 73; length of tail 115; length of hind foot 21 ; 

 length of ear 11; greatest length of skull 26.1; condyloincisive length 

 22.6; length of anterior palatine foramina 4.0; crown length of upper 

 toothrow 3.4; length of auditory bullae 10.1; least interorbital width 

 4.5; greatest width across zygomatic arches 14.3; greatest breadth of 

 skull 14.1. 



Remarks: The type is the only known specimen. In color it is 

 very similar to G. stigmonyx but has a smaller body with a tail equal to 



