Freshwater Fishes of South Africa. 



491 



head 2-^ times. Head with elevated profile, slightly more than twice 

 as long as broad ; snout rounded, with straight upper profile, as long 

 as broad, nearly f- postocular part of head ; eye 4| times in length of 

 head, a little more than If times in interorbital width, a little longer 

 than least depth of preorbital ; mouth small, slightly more than | 

 width of head, reaching to between nostril and eye ; scales on cheek 

 in 3 series, width of scaly part *- diameter of eye. Grill-rakers short, 

 slender, 23 on lower part of anterior arch. 





FIG. 124. Tilapia galilaea. Khartum (F.N.). -. 



Dorsal xvii 12 ; spines strong, last spine longest, nearly % length of 

 head ; longest soft rays length of head. Pectoral 1| times length 

 of head, extending to beyond vertical of origin of anal. Ventral 

 reaching to vent. Anal iii 11 ; 3rd spine a little shorter than longest 

 dorsal spine. Caudal truncate ; caudal peduncle ly times as deep as 

 long. Scales cycloid, 30 T 4 ; lateral lines -f-f. 



Colour (of preserved specimen), reddish brown above, whitish below, 

 with indistinct, narrow, dark cross-bands on body ; a dark opercular 

 spot ; an indistinct dark spot on base of anterior soft rays of dorsal ; 

 tip of ventral black. 



