TILAPIA. 



257 



of upper jaw ; 4 or 5 series of scales on the cheek, width of scaly part 

 less than diameter of eye. Gill-rakers short, 12 to 14 on lower part of 

 anterior arch. Dorstil XVIII-XX 9-11 ; sixth to ninth spines longest, 

 or spines subequal from the sixth, f to nearly ^ length of head, but 

 little shorter than longest soft rays. Anal III 8-9 ; third spine as long 

 as and much stronger than longest dorsal. Pectoral as long as head 

 or a little shorter, not extending to vertical of origin of anal. Ventral 

 reaching vent or anal, or not quite so far. Caudal feebly but very 



Tic. 173. 



Tilapia dardeniiii. 

 Type (Tr. Z. S. 1899). 



distinctly emarginate. Caudal peduncle H to 1| times as long as deep. 

 Scales mostly denticulate, 35-38 jq:;^ ; lateral lines Jsiiij' Yellowish 

 olive above, silvery beneath; 10 or 11 dark bars across the back, the 

 first between the eyes, sometimes replaced by transverse series of large 

 squarish spots ; yellow lines may be present along the series of scales ; 

 fins yellowish, dorsal witli olive marblings ; pectoral and anal red at 

 the base. 



Total length 230 millim. 



Lake Tanganyika. — Type in Congo Museum, Tervuereii. 



1. One of the types. Moliro. 



2. Ad. 



n-."). All. Kibwcsi. 



<•. Ad. Kahiinhu. 



(apt. Leiiiaire (C). 

 Dr. L. Sfcappers (('.) 

 Prof. J. E. S. Moore (C). 



