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 XV-XVI 12-13; last spine longest, ^ to f 

 length of head ; longest soft ray f to 1 length of head. Anal III 9-10 ; 



Vig. 106. 



Tilapia macroohir. 

 Tjpe, Victoria Falls, j. 



third spine f to J length of head. Pectoral 1-^ to 1^ times length of 

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

 venter anal. Caudal truncate or slightly emarginate. Caudal peduncle 

 deeper than long. Scales cycloid, 29-31 jg^^g ; lateral lines ifzi^. 

 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 blackish 

 spots, as often also on anterior part of body ; young with 7 to 1 narrower 

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

 longitudinal streaks. 



Total length 340 millim. 



Upper Zambesi ; Lakes Bangwelu and Mweru. 

 1-2. Types. Above Victoria Falls. T. CoJriiigton, Esq. (P.). 



3_12. „ Marambu R., 2 miles N. of „ 



Victoria Falls. 



VOL. III. M 



