226 



CICHLID.E. 



Caudal rounded, basal half densely scaled. Caudal peduncle slightly 

 longer than deep. Scales finely denticulate, 31 f^; lateral lines j-j- 

 Dark brown, with scattered blackish spots ; a blackish opercular spot ; 

 a round blackish spot at the root of the caudal ; fins grey, dorsal 

 and caudal broadly edged with black ; two small round white spots on 

 the posterior part of the anal. 



Total length 105 millim. 



Lake Nyassa. 

 1. Type. T^- Nyassa. I\lr. J- A. Williams (C). 



60. TILAPIA STIGMATOGENYS. 

 Bonleng. Rev. Zool. Afr. ii. 1913, p. ;59i. 



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

 Head nearly twice as long as broad ; snout rounded, with straight or 

 shghtly convex upper profile, a little broader than long, as long as or a 

 little shorter than postocular part of head, 1^ to ] | times diameter of 

 eye, which is 3^ (young) to 4^ times in length of head and equals 



Fig. 148. 



Tilapia stigmatojenys. 

 Type. 



interorbital width or depth of prseorbital ; mouth about f width of head, 

 extending to below anterior border of eye ; lips thick ; teeth in 3 or 4 

 series, outer moderately large and 40 to GO in upper jaw ; 4 or 5 series 

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

 Gill-rakers short, 7-8 on lower part of anterior arch. Dorsal XV 

 (rarely XYl) 9-10 (rarely 8) ; spines equal from the sixth, ^ length of 

 head ; longest soft rays f length of head. Anal III 7 ; third spine as 

 long as dorsals. Pectoral about | length of head, w'idely separated 



