TILAPIA. 



207 



long as or longer than eye, a little shorter than postocular part of head, 

 eye 3 (young) to 4 \ times in length of head, f to f interorbital width, 

 equal to or a little more than depth of praeorbital ; mouth moderate, 

 f to \ width of head, extending to between nostril and eye, or nearly to 

 below anterior border of latter ; teeth small, in 3 to 6 series, 40 (young) 

 to 80 in outer series of upper jaw ; 2 or 3 series of scales on the cheek, 

 width of scaly portion less than diameter of eye. Gill-rakers short, 

 9 to 12 on lower part of anterior arch. Dorsal X1II-XV 9-11 (very 

 rarely 12) ; last spine longest, |- to -f length of head ; longest soft rays 

 \ to once length of head. Anal III 9-10 ; third spine a little shorter 

 but stronger than last dorsal. Pectoral a little shorter than head, rarely 

 just as long, not reaching vertical of origin of anal. Ventral reaching 

 origin of anal or beyond. Caudal rounded or rounded-subtruncate. 

 Caudal peduncle as long as deep or a little deeper than long. Scales 

 cycloid, 27-29 "-^^ ; lateral lines ^r. Pinkish brown to dark olive- 

 brown, the scales sometimes with greenish-yellow margins; young with 

 seven to nine dark bars, which may persist, though feebly marked, in 

 the adult; a blue-black opercular spot; vertical fins with or without 

 yellow edge, with small dark spots, or dorsal and anal with oblique 

 darker and lighter stripes; a large blackish spot often present at the 

 base of the soft dorsal, between the anterior rays ; outer ventral rays 

 usually black. 



Total length 190 millim. 



Angola, Katanga, Lakes Mweru and Bangwelu, and Zambesi to Orange 

 River and Natal. 



Dr. Welwitsch (P.). 

 Dr. W. J. Ansorge ((J.), 

 ('apt. Lemaire (C). 



Dr. L. Stappers (C). 



F. H. Melland, Esq., and 

 Father Foulon (P.). 



F. H. Melland, Esq. (P.). 



Rev. L. Jalla (C.) ; Turin 

 Museum (P.). 



J. ff. Darling, Esq. (P.). 



Rev. F. A. Rogers and 

 E. G. Chubb, Esq. (P.). 



1-3. Ad. & 



Jo 



Fluilla, Angola. 



4. Yg. 





Que R., „ 



5-6. Ad. 





L. Pempere, Katanga. 



7-8. Yg. 





L. Diiolo, 



9. Ad. 





Kafubo R-, ,, 



10-11. Ad. 





L. Mweru at Pakalulwa. 



12-13. Yg. 





„ Lukonzohva. 



14. Type of 





L. Bangwelu. 



T.foul 



oni. 





15-21. Ad. .) 



fc yg- 



5) 



22. Hgr. 





Kazungula, Upper Zambes 



23. Ad. 





Mazoe, S. Rhodesia. 



24-25. Hgr. 





Umsitu R , Broken Hill, 



S. Rhodesia. 



20-27. Ad. 





Okovango R., near L. Nga 



