TILAPIA. 



219 



depth of prseorbital ; mouth moderate, about f width of head, extending 

 to between nostril and eye ; end of maxillary exposed ; lower jaw 

 slightly projecting ; teeth small, in 2 series, about 50 in outer row of 

 upper jaw ; 4 or 5 series of scales on the cheek, width of scaly part 

 equal to or a little less than diameter of eye. Gill-rakers short, 9 to 

 11 on lower part of anterior arch. Dorsal XIV-XV 10-11 ; last spine 

 longest, f length of head, longest soft rays about |. Anal III 8-9 ; 

 third spine as long as last dorsal. Pectoral about f length of head, not 

 extending to vertical of origin of anal. Ventral reaching vent. Caudal 

 rounded. Caudal peduncle as long as deep. Scales rather strongly 



denticulate, 30-32 



3*-4 



lateral lines 



18-22 



Brownish, with several 



rather ill-defined daikbars; a black opercular spot; a dark bar from 

 below the eye to the angle of the mouth; vertical fins with small spots, 

 forming oblique streaks on the dorsal. 



Total length 85 millim. 



Angola and Upi^er Zambezi. 



1. Hgr. Luculla R. at Luculla, Angola. Dr. W. J. Arisorge (C). 



2. Hgr. Kazungula, Upp. Zambesi. Eev. L. Jalla (C.) ; 



Turin Museum (P.). 



53. TILAPIA SWYNNERTONI. 

 Bonleng. Ann. & Mag. N. H. (7) xx. 1907, p. 50. 



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



Fig. 142. 



Tilajiia swynnertoni. 

 Type. 



Head twice as long as broad ; snout obtuse, with straight or convex 

 upper profile, slightly broader than long, shorter than postocular part 



