MAMMALS OF AXGLO-EGYPTIAX SUDAN — 5ETZER 543 



Skull relatively large, braincase well inflated, zygomata widely 

 flaring, nasals relatively long, interorbitum relatively narrow, auditory 

 bullae strongl}- inflated, posterior choanae \\-ide, and pterygoid fossae 

 small. 



Measurements of the Type Specimen': Length of head and 

 body 107; length of tail 63; length of hind foot 17; length of ear 17; 

 condylobasal length of skull 23.6; greatest width across zygomatic 

 arches 15.7; least interorbital width 4.1; crown length of upper tooth- 

 row 3.3; condyloincisive length 25.2; length of nasals 11.3; 'svidth of 

 rostrum at level of antorbital foramen 6.1. 



Comparisons: Graphiurus murinvji marrensis differs from G. m. 

 sudanensis in somewhat paler color, hghter belly, and Hghter colored 

 tail. The skull has more open posterior choanae, larger buUae, -wider 

 zygomatic arches, wider rostrum, and more inflated braincase. 



From G. m. butleri, G. m. marrensis differs in somewhat Hghter 

 color throughout. The skuU is somewhat smaller, the auditory bullae 

 are more inflated, the posterior choanae are more open, the rostrum 

 is wider, and the braincase is more inflated. 



While no specimens of Graphyiurus orobimis have been available, it 

 would seem that G. m. marrensis can be distinguished by its longer 

 hind foot. 



Remarks: Xo actual intergradation has been demonstrated in the 

 dormice of the Sudan, but the characters by which the kinds may be 

 distinguished from one another are at best only of subspecific rank. 



Little distinction can be made between the three kinds knowTi to 

 occur in the Sudan by means of external measurements and in most of 

 the cranial measurements. However, the degree of difference in color, 

 the degree of inflation of the braincase and the auditory bullae, and 

 the configuration of the posterior choanae readily separate these 

 dormice. 



Graphiurus murinus butleri Dollman 



Figure 8,c 



Graphiurus butleri Dollman, Ann. Mag. Nat. Hist., ser. 8, vol. 9, p. 319, March 

 1912. (Jebel Ahmed Aga.) 



Specimens Examined: Sis, aU in BM, from: Jebel Ahmed Aga, 1; 

 Delami, 3; Xuba Mountains, 2. 



Measurements: The cranial measurements of the t^'pe, an adult 

 male, are as foUows: Cond^dobasal length of skull 23.9; least inter- 

 orbital width 4.3; crown length of upper toothrow 3.2; condyloincisive 

 length 25.5; length of nasals 11.1; width of rostrum at level of 

 antorbital foramen 5.9. 



386559 — 56 T 



