152 



CICHLID,E. 



diameter of eye. Gill-rakers short, 15 to 19 on lower part of anterior 

 arch. Dorsal XVI^XVTI 10-13; last spine longest, about ^ length of 

 head ; longest soft rays f to nearly once length of head. Anal IV^ 9-10 ; 

 fonrrh spine longest, about f length of head. Pectoral as long as or 

 sliglitly longer than head, reaching vertical of origin of anal, or not 

 quite so far. Ventral reaching vent or anal. Caudal truncate. Caudal 

 peduncle as long as deep or a little deeper than long. Scales •t'ycloid,' 

 30-32 ,":— ; lateral lines ]^-^. Uniform dark brown. 



Total length 270 millim. 



Lake Xyassa and Upper Shire ; Lower Zambesi. 



l-i. Type 



5-6. Ad. 

 7. Skel. 

 {<. Ad. 



Upper Sliire. 

 L. Nyu.^sa. 



Iduiida R , Lower Bu/.i R., 



Portuiiuese East Africa. 



Dr. Percy Rendall (C.) ; 



Sir H. H. Joluiston (P.). 

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



V. F. M. Svvynnerton, Esq. 



(P.). 



.3. TILAPIA NIGRA. 



Oreochromis niger, GLintli. Proc. Zool. Soc. 1894, p. 89, [)]. ix. ; Pellegr. Mem. Soc. 



Zool. France, xvi. ]901, p. 355. 

 T'dapia nigra, Bouleng. Proc. Zool. Soc. 1899, p. 110. 



Depth of body 2^; to 2^ times in total length, length of head 3 to 

 3^ times. Plead ]| to If times as long as broad ; snout rounded, with 

 straight upper profile, broader than long. |-to -| postocular part of head ; 

 eye 5 to 5^ times in length of head, 2 to 2^ times in interorbital width, 

 equal to or a little less than pra^orbital depth ; mouth rather large, 

 I to I width of head, extending nearly to below anterior border of eye; 

 teeth in 4 or 5 series, 80-100 in outer series of upper jaw * ; 2 or 3 

 series of scales on the cheek, w-idth of scaly part equal to diameter of 

 eye. Gill-rakers short, 17 on lower part of anterior arch. Dorsal XVII 

 11-12 ; last spine longest, and quite \ length of head ; middle s^oft rays 

 much produced, longer than head. Anal IV 9 ; fourth spine longest, 

 nearly as long as last dorsal. Pectoral as long as head, extending to 

 vertical of origin of anal. Ventral reaching anal. Caudal truncate 

 or slightly emarginate. Caudal peduncle deeper than long. Scales 



* The outer teeth are mostly conical or iiidistiiicllj bicus])id in the larger 

 specimen. 



