172 



CICHLIDM. 



3f times. Head If to 2 times as long as broad ; snout rounded, 

 with straight or convex upper profile, as broad as or a little broader 

 than long, as long as or shorter than postocular part of head; 

 eye 4 to 51 times in length of head, I to f interorbital width, 

 equal to or a little less than prseorbital depth; mouth moderate, 

 f to f width of head, extending to between nostril and eye ; teeth 

 in 4 (young) to 8 series, 60 (young) to 110 in outer series of upper 

 jaw ; 2 or 3 series of scales on the cheek, width of scaly part not greater 

 than diameter of eye. Gill-rakers moderately long, 20 to 25 on lower 

 part of anterior arch. Dorsal XV-X VI (rarely XVII) 11-13 ; last spine 

 longest, f to a little over ^ length of head ; longest soft rays f to 1 

 length of head. Anal III 9-11 ; third spine ^ to f length of head. 



■ Piff.no. 



7'ilapia andersonii. 

 Type of T . Jlavomarginata (A. M. C). f . 



Petcoral 1 to Ij times as long as head, reaching vertical of origin of 

 anal, or beyond. Ventral reaching anal or vent, or not quite so far. 

 Caudal truncate or slightly emarginate. Caudal peduncle deeper than 



S— Hi . 17—23 



long. Scales cycloid, 29-33 j2ij^ ; lateral lines jyzxe- Dark brown, the 

 scales with lighter centres, or edged with whitish ; head sometimes with 

 large black spots ; a black opercular spot ; vertical fins brownish, 

 purplish, or blackish, usually Avith round white spots; dorsal and anal 

 edged with yellowish (red in life). 



Total length 290 millim. 



Lake Xi^ami district, Angola, Congo, Gaboon. — Type lost. 



