>o THE TANGANYIKA PROBLEM. 



yellow, spotted with dark brown ; pectoral yellow ; branchiostegal membrane, 

 pectoral region, outer edge of ventrals, and anal vermilion-red. 



Total length, 120 millim. 



Two specimens of this handsomely coloured fish, which bears the native name 

 " Kasanga Malengi," on M, Dardenne's coloured sketch. 



71. Tilapia dardennii. — Blgr. 1899. (Fig. facing p. 200.) 



Teeth very small, in 4 or 5 series in both jaws, outer bicuspid, separated from 

 the series of smaller tricuspid teeth by a rather wide interspace. Depth of body 

 3 to 3 \ times in total length, length of head 3 \ to 3J. Snout, with strongly curved 

 upper profile, little longer than the diameter of the eye, which is 3] times in 

 length of head and equal to or a little less than interorbital width ; mouth small, \ 





v. 



Tilapia pleurotaenia. See p. 202. 



width of head, extending to between nostril and eye ; 5 or 6 series of scales on 

 cheek ; large scales on the opercle. Gill-rakers short and thick, 13 on lower 

 part of anterior arch. Dorsal XIX. 10 ; sixth to ninth spines longest, not quite half 

 length of head, a little shorter than longest soft rays. Pectoral acutely pointed, as 

 long as or slightly shorter than the head, not extending to origin of anal. Ventral 

 reaching vent, or not quite so far. Anal III. 8 ; third spine as long as and 

 much stronger than longest dorsals. Caudal feebly emarginate. Caudal peduncle 



lat. 



24 — 25 

 1. . Yellowish 



17—19 



if, or if as long as deep. Scales, mostly ctenoid, 37 — 



olive above, silvery beneath, with 10 or 11 dark dorsal cross-bars, the first between 

 the eyes ; yellowish streaks along the series of scales ; fins yellowish, dorsal with 

 some olive marblings, pectoral and anal red at the base. 



Total length, 155 millim. 



Described from two specimens Native name, " Sangani." 



