364 On new Species q/*Pdaminoniy3. 



The following are further details about the new forms : — 



Psammomys aJgiricua. 



Size large. General colour above deep sandy bufFy. 

 Sides rich yellow or yellowisii bufTy, belly paler yellow. 

 (Cheeks whitish yellow, sharply contrasting with the deep 

 buffy forehead and top of muzzle. Tail dark fulvous, the 

 litlle developed brush blackish. 



Skull elongate; nasals narrow; interparietal of medium 

 size, its anterior border evenly convex forwards; bulla? 

 medium. 



Dimensions of the type (measured in the flesh) : — 



Head and body 151 millim. ; tail 125; hind foot 33; 

 ear 13. 



Skull : upper length 43 ; basilar length 37 ; zygomatic 

 breadth "16' 6 ; nasals 10; interorbital breadth Q'Q ; least 

 breadth between ridges on parietals 11 ; breadth between 

 anterior lips of meatus 25; length of exposed upper area of 

 bulla 5 ; diastema 13'7 ; greatest diameter of bulla 16; lesser 

 diameter, from anterior lip, 12. 



Hah. Southern Algeria. Typical locality Biskra. 



Type. Old female. B.M. no. 97. 6. 9. 9. Collected 21st 

 February, 1897, and presented by the Rev. A. E. Eaton. 



A skin from Sfax, Tunis, colled ed by Eraser, ap|)ears to 

 belong rather to the Tripolitan than to the Algerian form. 



According to Lataste, whose identifications it seems wise 

 to follow, no new names were given by Loche or Levaillant 

 to the Algerian Psammomys, their specimens of it being 

 erroneously referred to Meriones robustus and Shawii. 



It is probable that the smaller Tripolitan form also occurs 

 in Algeria, but I take the large Biskran examples obtained 

 by Mr. Eaton as representing the present species. 



Psammomys terrce- sanctce. 



External characters as in the last species, except that the 

 colour appears to be a little paler, and the tail in the single 

 skin is of the same tone as the body instead of being darker, 

 but this is probably of no importance. 



Skull much elongated, largest of the genus. Bulhe very 

 large and well inflated. 



JJimensions of the type (measured in spirit, therefore no 

 doubt contracted) : — 



Head and body 162 millim. j tail 138; hind foot 36; 

 ear 14. 



Skull : upper length 47 ; basilar length 38"7 ; zygomatic 



