260 ^Ir. G, A. Boulengeron 



than back. Flanks pale reddish buff (yellowish salmon no. 1, 

 ' Edpertoire de Conleurs^), tlie general effect much paler and 

 purer in colour than in mullah. Spines on flanks with white 

 bases and pale reddish tips, no suggestion of the brownish 

 tips such as occur in mullah. Sides of face and neck white, 

 washed with pale brownish buif. Backs of hands and feet 

 pure white. Ventral surface of body white. Tail similar to 

 that of A. mullah, but lighter on the dorsal surface. 



Skull smaller than in A. mullah ; nasals and palatal 

 foramina markedly shorter, cheek-teeth rather smaller. 



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



Head and body 105 mm.; tail 105; hind foot 17; 

 ear 18. 



Skull: greatest length 30; basilar length 23; condylo- 

 incisive length 26'6; zygomatic breadth 14 4; interorbital 

 constriction 5 ; breadth of brain-case (across squamosal 

 region) 12*6 ; greatest length of nasals 11*5 ; length of 

 palatal foramina 7 ; width across palate (inside m^) 3 ; 

 length of upper molar series 4*5. 



Hah. Bulliar, Somaliland. Altitude, coast. 



T'ype. Adult male. Original number 3 19. Collected on 

 December 23rd, 1910, by Dr. R. E. Drake-Brockman and 

 presented by him to the British Museum. 



The exceedingly pale colour of the dorsal surface of this 

 new form at once distinguishes it from the allied species 

 A, mullah, while the cranial differences, noted above, 

 necessitate the two forms being considered specifically 

 distinct. It is interesting to note that this new species 

 appears to occur only on the coast, whereas A. mullah is 

 confined to the interior, the type locality being Harrar. 



In addition to the type. Dr. Drake-Brockman collected 

 six further specimens of this Acomys at Bulbar, all agreeing 

 in the pale coloration of the dorsal surface. It gives me 

 great pleasure to name this new species after Dr. Drake- 

 Brockman, who has already done so much to enlighten 

 zoological science on the mammalian fauna of Somaliland 

 and Abyssinia. 



XXXI. — Descriptions of new African Cyprinodont Fishes. 

 By G. A.'Boulengek, F.R.S. 



(Publislied by permission of tlie Trustees of the British Museum.) 



A REVISION I have recently made of the African Cyprinodonts 

 has resulted in the establishment of several new species, some 



