482 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



of head and body 270, 316; length of tail 246, 247; length of hind 

 foot 65, 68; length of ear 17, 16; greatest length of skull 62.5, 62.9; 

 condyloincisive length 57.5, 57.6; greatest width across zygomatic 

 arches 33.4, 32.7; length of nasals 19.3, 19.8; crown length of upper 

 toothrow except P^ 11.9, 11.9. 



Remarks: The color difference between limitaneus and leucoum- 

 brinus is quite pronounced. The former is quite pale and rather 

 uniform in color in the series examined, while the latter is relatively 

 dark and not so uniform in the intensity' of color. The onlj'^ speci- 

 mens shov/ing a deviation in color are those from Dillmg and Talodi. 

 The specimens from these two localities are darker than the Jebel 

 Marra material but are hghter than specimens from east of the Nile. 

 In cranial ciiaracters they are like limitaneus. 



Family Cricetidae 



Subfamily Lophiomyinae 



Lophiomys imhausi aethiopicus (Peters) 



Figure 4,4 



Phractomys aethiopicus Peters, Zeitschr. Ges. Naturw., Berlin, vol. 29, p. 195, 

 1867. (Maman, north of Kassala, Anglo-Egyptian Sudan.) 



Specimen Examined: One, from near Port Sudan, in BM. 



Measurements: The above specimen, an adult male, measures 

 as follows: Length of hind foot 42; length of ear 20; greatest length 

 of skull 55.2; condyloincisive length 50.2; length of anterior palatine 

 foramina 8.5; crown length of upper toothrow 11.7; greatest width 

 across zj'gomatic arches 30.8; length of nasals 17.9; least interorbital 

 width 11.1; greatest breadth of cranial shield 31.9; width of rostrum 

 at level of antorbital foramen 8.5. 



Remarks: The subspecific name as used above is only tentative 

 since there appears to be some doubt as to its validity. Certainly 

 the only specimen available was different in color and in general size 

 from typical imhausi identified as such in the British Museum. No 

 specimens of typical aethiopicus were available for comparison. 



Subfamily Gerbillinae 



Genus Gerbillus Desmarest 



EUerman (1941, pp. 502-503) attempted to group the various 

 species of the subgenus Dipodillus. He placed lowei in the campestris 

 group; principulus in the garamantis group; stigmonyx, watersi, and 

 mackilligini in the dasyurus group; and muricidus in the simoni group. 



