TlLAPlA. 



153 



cycloid, 32 "j^ ; lateral lines j^^^. Greenish black; a black opercular 

 spot; fins blackish, soft dorsal and caudal with more or less distinct 

 round light spots between the rays. 



Total length 250 millim. 



Athi Kiver System, British East Africa. 

 1-2. Types. Pools on Kibwesi R. 



rig. 99. 



Prof. J. W. Gregory (P.). 



l^ilcqiia nigra. 

 Type, after Giiiither {I. c). 



4. TILAPIA KAFUENSIS. 

 Bouleng. Ann. & Mag. N. H. (8) x. 1912, p. 138. 



Depth of body 2| times in total length, length of head 3 times. 

 Head 1 1 times as long as broad; snout rounded, with straight up])er 

 profile, slightly broader than long, a little shorter than postocular jtart 

 of head ; eye 5^ times in length of head, | interorbital widih, a little 

 less than pra^orbital depth ; mouth rather large, -|- width of head, 

 extending to between nostril and eye ; teeth in 8 series, 1 10 in outer 

 series of upper jaw; 4 series of scales on the cheek, width of scaly part 

 a little greater than diameter of eye. Gill-rakers mcderate, 25 on lower 

 part of anteiior arch. Dorsal XVII 13; last spine longest, | length of 

 head ; longest soft ray f length of head. Anal III 11 ; third spine not 

 quite I length of head. Pectoral slightly longer than lioad, reaching- 



