TILAPIA. 



265 



Bonleng 



93. TILAPIA BOOPS. 



Ann. & Mag. N. H. (7) vii. 1901, p. 5, Poiss. Buss. Congo, p. 476 

 (1901), and Tr. Zool. Soc. xvi. 1901, p. 158, pi. xix. fig. 5. 

 Oplithalmotilapia hoojis, Pellegr. Mem. Soc. Zool. France, xvi. 190-4, p. 345. 



Depth of body equal to length of head, 3^- to 3^ times in total 

 length. Head twice as long as broad ; snout short and rounded, with 

 strongly convex upper profile, broader than long, as long as postocular 

 part of head ; eye 1\ times in length of head, a little exceeding inter- 

 orbital width, more than twice as long as least pra?orbital depth ; mouth 

 small, subinferior, § width of head, not extending quite to below anterior 

 border of eye ; teeth very small, tricuspid, in 3 series, about 70 in outer 

 series of upper jaw ; 2 or 3 series of scales on the cheek, width of scaly 





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Fig. 180. 



-^iesig 





Tilapia Loops. 

 Type(Tr. Z. S. 1901). 



part not half diameter of eye. Gill-rakers short, 13 on lower part of 

 anterior arch. Dorsal XII-XIII 14 ; spines feeble, equal in length 

 from the seventh, which measures nearly ^ length of head ; soft rays 

 scarcely longer. Anal III 8-9 ; third spine as long as and stronger 

 than dorsals. Pectoral as long as head, reaching origin of anal. 

 Ventral produced into a filament, extending beyond origin of anal. 

 Caudal with deep crescentic notch. Caudal peduncle nearly twice as 



long as deep. Scales feebly denticulate, 39-40 5^773; lateral lines jipjg' 

 Brown above, white beneath ; a blackish opercular spot. 



Total length 90 millim. 



Lake Tanganyika. 

 1-2. Types. Msambu. Prof. J. E. S. Moore (C). 



