226 



C1CHLID.E. 



Caudal rounded, basal half densely scaled. Caudal peduncle slightly 

 longer than deep. Scales finely denticulate, 31 jg ; lateral lines jy 

 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. L. Nyassa, Mr. J. A. Williams (C). 



CO. TILAPIA STIGMATOGENYS. 

 Bouleng. Rev. Zool. Afr. ii. 1913, p. 394. 



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 

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

 little shorter than postocular part of head, lij to H times diameter of 

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



Fig. 148. 



Tilapia stlgmatogenys. 

 Type. 



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

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

 series, outer moderately large and 40 to 50 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 XVI) 9-10 (rarely 8) ; spines equal from the sixth, ^ length of 

 head ; longest soft rays -f length of head. Anal 111 7 ; third spine as 

 long as dorsals. Pectoral about § length of head, widely separated 



