504 



PROCEEDINGS OF THE NATIONAL AltJSEUM 



arches 13.0; least interorbital width 4.1; length of nasals 9.6; crown 

 length of upper toothrow 4.0. 



Figure 5. — Distribution of Gerbillus (in part), Tatera, Taterillus, and Grammomys in 



the Anglo-Egyptian Sudan. (Scale: 1 inch=400 miles.) 



Remarks: Both the type and the paratype of this subspecies have 

 broken skulls so that no complete measurements are possible. This 

 subspecies seems to be the smallest of the group found in the Sudan. 



Apparently the distribution of this form lies to the west of the Nile 

 and to the east of the Jebel Marra. While no actual intergradation 

 of the various kinds has actually been demonstrated, they are^here 



