TILAP1A. 



153 



3-4 



cycloid, 32^; lateral lines U 



^jy. Greenish black ; a black opercular 

 spot; fins blackish, soft dorsal and caudal with more or less distinct 

 round light spots between the rays. 



Total length 250 millim. 



Athi River System, British East Africa. 

 1-2. Types. Pools on Kibwesi R. 



Fig. 99. 



Prof. J. W. Gregory (P.). 



*j,:-* 



-*^ 



Tilapia nijra. 

 Type, after Giinther (I. c). |. 



4, TILAPIA KAFUEXSLS. 

 Bouleng. Ann. & Mag. N. H. (8) x. 1912, p. 138. 



Depth of body 2j times in total length, length of head 3 times. 

 Head 1|- times as long as broad ; snout rounded, with straight upper 

 profile, slightly broader than long, a little shorter than postoculnr part 

 of head; eye 5-j times in length of head, \ interorbital width, a little 

 less than prseorbital depth ; mouth rather large, -f width of head, 

 extending to between nostril and eye ; teeth in 8 series, 110 in outer 

 series of upper jaw ; 4 series of scales on the cheek, width of scaly part 

 a little greater than diameter of eye. Gill-rakers moderate, 25 on lower 

 part of anterior arch. Dorsal XVII 13 ; last spine longest, f length of 

 head ; longest soft ray § length of head. Anal III 11 ; third spine not 

 quite \ length of head. Pectoral slightly longer than head, reaching 



