320 On new African Dormice. 



the same flat brain-case and the constricted iuterorbital 

 region. 



Dimensions of the type (measured from the drj skin) : — 



Head and body 110 mm. ; tail 63* ; hind foot 17*7 ; 

 ear 14. 



Skull : greatest length 28*6 ; basilar length 22 ; condylo- 

 basilar length 24 ; condylo-incisive length 26 ; zygomatic 

 breadth 15'3 ; iuterorbital constriction 4 ; squamosal breadth 

 of brain-case 11'9; greatest occipital breadth T2"3 ; greatest 

 length of nasals 11*4 ; greatest anterior width across nasals 

 3*y ; palatilar length 9 ; width of palate (inside m^) 3*7 ; 

 width across palate (outside ni^) 5'8 ; length of palatal 

 foramina 3-7; postpalatal length 13; length of upper 

 tooth-row 3*3. 



Hab. Jebel Ahmed Aga, Sudan. 



Type. Adult male. B.M. no. 11. 11. 25. 84. Original 

 number 168. Collected by Mr. A. L. Butler on January 

 10th, 1910. 



This Sudan dormouse is evidently closely related to 

 G. woosnami, a species recently founded on a specimen 

 collected by Mr. B. Woosnam in the Kalahari Desert, South 

 Africa. 



There is considerable difference in the colour of the 

 two forms, the ashy suffusion which dominates the general 

 greyish tint in butleri is almost entirely absent in woosnami. 

 In general skin and cranial dimensions butleri is con- 

 spicuously smaller than the Kalahari species. 



Geographically, G. orobinus, Wagn., is the nearest 

 relative of Butkr's dormouse. Graphiurus orobinus is said to 

 come from " Sennaar"" ; the original description is so in- 

 complete that it is quite impossible to form any definite 

 idea as to the general characters of the species, even supposing 

 it can be referred to this genus, lieuvens was unable to 

 trace the whereabouts of the type and only quotes from 

 AYagner's two descriptions. It orobinus is really a GrapJii- 

 urus it would appear to be a darker and smaller species than 

 butleri, the hind foot being given as only 10 mm. in length, 

 and therefore it is probably more nearly related to G. per- 

 sonatus and the small parvus group than to the larger 

 species. 



* Rejrenerated. 



