TILAPIA. 235 



indistinct or absent, sometimes another below posterior bovder of eye ; 

 a black opercular spot ; more or less indistinct dark bars on the body, 

 and a lateral series of blackish blotches sometimes confluent into a 

 longitudinal band ; dorsal fin greyish, usually with small darker or 

 lighter spots ; anal and lower half of caudal bright yellow, the former 

 usually with one, two, or three orange ocellar spots encircled with red ; 

 ventrals usually black or blackish. 



Total length ]10 millim. 



Lake Victoria, Victoria Nile, Lake Albert Edward. 



1-10. Types. Entebbe. Mr. E. Degen (C). 



11-12. Types. Buganga. ,- 



13-18. Types. Bunjako. ?i 



19. Skel. 



20, 21-24. Ad. & Sesse Islands. Dr. E. Bayon (C.) ; 



lior. Genoa Museum (P.)« 



25-26. Ad. Buddu Coast. Mr. M. Simon (C). 



27. Ad. Kavirondo Bay. M. Alluaud (0.) ; 



Paris Museum (E.). 

 28-20. Ad. Kisumu Bay, Kavirondo. A. Blayney PerciVal, Esq. (P.). 



30-31. Ad. Jinja, Ripon Falls. Dr. E. Bayon (C.) ; 



Genoa Museum (P.). 



32. Ad. Buhilo, L. Kioga. 



08. riLAPIA NUBILA. 



Bouleng. Ann. & Mag. N. H. (7) xvii. 190G, p. 450, Fish. Nile, p. 517, \)\. xci. 

 fig. 4 (1907) ; Pellegr. Mem. Soc. Zool. France, x.xii. 1910, p. 29G ; Bouleng. 

 Ann. Mus. Genova, (3) v. 1911, p. 73. 



Depth of body equal to length of head, 2f to o times in total length. 

 Head 2 to 2\ times as long as broad ; snout as long as broad, with 

 straight or slightly convex upper profile, as long as eye, which is 3 

 to 3| times in length of head, equals interorbital width, and much 

 exceeds least deptli of prjeorbital ; mouth with thick lips, extending to 

 below anterior border of eye or not quite so far; teeth in 3 or 4 series, 

 outer largest and numbering 40 to GO in upper jaw ; 3 or 4 series of 

 scales on the cheek, width of scaly part nearly equal to diameter of eye 

 in adult. Gill-rakers rather short, 8 or 9 on lower part of anterior arch. 

 Dorsal XV-XVI 8-10 ; spines increasing in length to the last or last 

 four, I to I length of head ; longest soft rays -| to j length of head. 

 Anal 111 S-10 ; thiitl spine as long as longest dorsal. Pectoral | to 



