484 PROCEEDINGS OF THE NATIONAL MUSEUM voi. loe 



Gerbillus (Dipodillus) lowei (Thomas and Hintun) 



Figure 4,d 



Dipodillus lowei Thomas and Hinton, Proc. Zool. Soc. London, p. 261, July 6, 

 1923. (Jebel Marra, Darfur.) 



Specimens Examined: Twenty-four, all in BM, from: Jebel 

 Marra, 12; Southeai3t Downs, Jebel Marra, 2; central Jebel Marra, 10. 



Measurements: The averages and extremes of two males and tliree 

 females, from Jebel Marra, are, respectively, as follows: Length of 

 Jiead and body 111 (109-113), 110 (110); length of tail 146 (141-151), 

 146 (143-152); length of hind foot 25.5 (24-27), 26 (25-28); length 

 of ear 15.5 (15-16), 16 (15-17); greatest length of skull 30.9 (30.5- 

 31.3), 30.7 (29.2-31.7); condyloincisive length 26.9 (26.7-27.2), 

 26.8 (25.1-28.1); length of anterior palatine foramina 6.0 (5.8-6.3), 

 5.8 (5.3-6.2); crown length of upper tootlu-ow 4.35 (4.3-4.4), 4.4 

 (4.3-4.6); length of auditory bullae 9.3 (9.2-9.4), 9.4 (8.8-9.7); least 

 interor])ital width 5.3 (5.2-5.4), 5.3 (5.1-5.5); length of nasals 11.7 

 (11.6-11.9), 11.9 (11.6-12.3); width of rostrum at level of antorbital 

 foramen 3.2 (3.1-3.3), 3.0 (2.9-3.1); greatest width across zygomatic 

 arches 15.6 (15.6), 15.2 (14.9-15.6); greatest breadth of braincase 

 14.7 (14.7), 14.2 (14.1-14.3). 



Remarks: This species is large and dark, by far the most saturate 

 of any of the gerbils found in the Sudan. The white has been reduced 

 to a minimum on the hands, feet, belly, and cheeks. The tail is dark 

 with a black brush but which is not so well developed as in G. mackil- 

 ligini. The skull is more massive than in G. stigmonyx and is quite 

 reminiscent of the skull of the smaller members of the genus Tatera. 



Gerbillus (Dipodillus) muckilUgini (Thomas) 



Figure 4,rf 



Dipodillus mackilligini Thomas, Ann. Mag. Nat. Hist., ser. 7, vol. 14, p. 158, 

 August 1904. (Wadi Alagi, eastern desert of Nubia, about lat. 22° N., long. 

 35° E.) 



Specimens Examined: Four, all in BM, from Eastern Egyptian 

 desert, lat. 22° N., long. 35° E. 



Measurements: An adult male and an adult female, from the 

 above locality, respectively measure as follows: Length of head and 

 body 78, 75; length of tail 138, 114; length of bind foot 24, 22; length of 

 ear 14, 12; greatest length of skull 27.0, 26.2; condyloincisive length 

 23.4, 22.7; length of anterior palatine foramina 4.7, 4.6; crown length 

 of upper toothrow 3.7, 3.8; length of auditory bullae 10.1, 9.5; least 

 interorbital width 4.8, 4.8; length of nasals 10.6, 9.8; width of rostrum 

 at level of antorbital foramen 2.7, 2.6; greatest width across zj^gomatic 

 arches 13.5, 13.2; greatest breadth of braincase 13.5, 13.4. 



