TILAPIA. 235 



indistinct or absent, sometimes another below postcrioi- 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 (0.). 



11-12. Types. Bnganga. 



i;^-18. Types. Bunjako. 



UK Skel. „ ' 



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



H''- Genoa Museum (P.). 



25-2(J. Ad. Bnddu Coast. Mr. M. Simon (C). 



27. Ad. Kavh-ondo Bay. M. AUuaud (0.) ; 



Paris Museum (E.). 



28-29. Ad. Kisumu Bay, Kuvirondo, A. Blayney Percival, Esq. (P.). 



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



32. Ad. Bululo, L. Kioga. 



Genoa Museum (P.). 



G8. TILAPIA NUBILA. 



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

 fig. 4 (1907) ; Pellegr. Mem. See. Zool. France, xxii. 1910, p. 296; Bouleng, 

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



Depth of body equal to length of head, 2f to 3 times in total length. 

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

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

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

 exceeds least depth of praeorbital ; 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 60 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, f to -|- length of head ; longest soft rays -I to f length of head. 

 Anal 111 8-10; third spine as long as longest dorsal. Pectoral f to 



