152 CICHLTD.E. 



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

 arch. Dorsal XVI-XVII 10-13; last spine longest, about \ length of 

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

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

 slightly 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 cycloid, 

 30-32 '-^f- ; lateral lines £^L. Uniform dark brown. 



Total length 270 millim. 



Lake Nyassa and Upper Shire ; Lower Zambesi. 



1-4. Type. Upper Shire. Dr. Percy Eendall (C.) ; 



Sir H. H. Johnston (P.). 

 5-6. Ad. L. Nyassa. Prof. J. E. S. Moore (C). 



7. Skel. „ „ 



8. Ad. Idunda R., Lower Bn/.i R., 0. F. M. Svvynnerton. Esq. 



Portuguese East Africa. (P-)- 



?>. TILAPIA NIGRA. 



Oreochromis niger, Giinth. Proc. Zool. Soc. 1894, p. 89, pi. ix. ; Pellegr. Mem. Soc. 



Zool. France, xvi. 1904, p. 355. 

 Tilapia nigra, Bouleng. Proc. Zool. Soc. 1899, p. 110. 



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

 3f times. Head 1| to If times as long as broad ; snout rounded, with 

 straight upper profile, broader than long, f to f 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 prseorbital depth ; mouth rather large, 

 -§ to |- 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, width 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 j length of head ; middle soft 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 indistinctly bicuspid in the larger 

 specimen. 



