TILAPIA. 



209 



and with dark and light spots, or with black streaks ; outer ventral rays 

 black or blackish. 



Total length 100 millim. 



Angola. Bechuanaland, Rhodesia, Katanga, Lake Bangwelu.— Type 

 in Vienna Museum. 



Tilapia oralis. 

 L. Bangwelu. 



1. Yg. 

 2-3. Hgr. 

 4-5. Yg. 

 6-10. Ad., hgr., 

 & vs. 



Cbiringa, N.W. Rhodesia. 

 Lofoi, Katanga. 

 L. Dilolo, Katanga. 

 L. Bangwelu. 



Franklin White, Esq. (P. 

 ('apt. Leniaire (('.). 



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



4a. TILAPIA STEINDACHNERI. 

 Bouleng. Ann. & Mag. N. H. (8) xii. 1913, p. 483. 



Depth of body nearly equal to length of head, 2-^ to 3 times in total 

 length. Head a little more than twice as long as broad ; snout with 

 convex upper profile, as long as broad or a little longer than broad, as 

 long as postocular part of head ; eye 3-| (young) to 4 h times iu length 

 of head, equal to interorbital width or suborbital depth ; mouth 

 moderate, about § width of head, extending to between nostril and eye ; 

 teeth small, in 3 series, 40 to 60 in outer row of upper jaw ; 4 series of 

 scales on the cheek, width of scaly part equal to or a little less than 

 diameter of eye. Gill-rakers short, 12 to 14 on lower part of anterior 

 arch. Dorsal X1V-XV 12-13; spines equal in length from the sixth 

 or seventh, -g- to not quite ^ length of head ; longest soft rays about ^ 

 length of head. Anal HI 8-9 ; third spine as long as and stronger 

 than last dorsal. Pectoral f to f length of head, nearly reaching 



VOL. in. p 



