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, 1:^ to 14 on lower part of 

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

 or spines subequal from the sixth, f to nearly J 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 



Fi?. ]73. 



r-"- ^> 



Tilajiia dardennii. 

 Type (Tr. Z. S. 1899). f . 



distinctly emarginate. Caudal peduncle IJ to If times as long as deep. 

 Scales mostly denticulate, 35-38 j^ ; lateral lines ^^. 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 with olive marblings ; pectoral and anal red at 

 the base. 



Total length 230 millim. 



Lake Tanganyika.— Type in Congo Museum, Tervueren. 



1. One of the types. Moliro. 



2. Ad. 



3-.5. Ad. Kibvvesi. 



6. Ad. Kuhuubo. 



VOL. TII. 



Capt. Lemaire (C). 

 Dr. L. Stappers (0.) 

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



