TILAPIA. 



161 



series of scales on the cheek, width of scaly part not greater than 

 diameter of eye. Gill-rakers moderate, 21 to 25 on lower part of 

 anterior arch. Dorsal XA^-XVI 12-13; last s[)ine longest, ^ to | 

 length of head ; longest soft ray f to 1 length of head. Anal III 0-10 ; 



Fi«. 105. 



2'llapia mucrocliir. 

 Type, Victoria Falls. \. 



third spine J (o J length of head. Pectoral 1^ to H times length of 

 head, reaching beyond vertical of origin of anal. Ventral reaching 

 vent or anal. Caudal truncate or slightly emarginate. Caudal peduncle 

 deeper than long. Scales cycloid, 29-31 j|~^jl ; lateral lines Jj ~. 

 Olive-brown above, golden-yellow beneath, sometimes with rather indis- 

 tinct darker longitudinal streaks following the series of scales; a 

 blackish opercular spot ; head usually with small brown or blackiisli 

 spots, as often also on anterior part of body ; young with 7 to 10 narrower 

 vertical dark bars ; dorsal fin with more or less distinct dark and liglit 

 longitudinal streaks. 



Total length 340 millim. 



Upper Zambesi ; Lakes Bangwelu and Mweru. 

 1-2. Types. Above Victoria Falls. T. Codrington, E.sq. (P.). 



3-12. 



Marambu R., 2 miles N. of 

 Victoria Falls. 



