200 Mr. G. A. Boulenger o« 



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

 ' K^))er1oire de Couleurs '), the general eifect much paler and 

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

 bases and pale reddish tips, no suggestion of the brownish 

 ti)is such as occur in mullah . Sides of face and neck white, 

 washed with pale brownish buff. Backs of hands and feet 

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

 tiiat 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- 

 incit^ive 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. 



IJab. Bulbar, Somalilaud. Altitude, coast. 



Ti/pp. Adult male. Original number 319. Collected on 

 December 23rd, 11)10, 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 distingui-shes 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 

 ajipears 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 Acoinys at Bulbar, all agreeing 

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

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

 Brockman, wiio has already done so much to enlighten 

 zoological science on the mammalian fauna of Somalilaud 

 and Abyssinia. 



-XXXI. — Descriptions of ueic African Cyprinodont Fishes. 

 By G. A. BouLENQER, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



A REVISION 1 have recently made of the African Cypriuodonts 

 has resulted in the establishment of several new species, some 



