The Freshwater Fishes of South Africa. 507 



36 in upper jaw, with aii inner row of very minute teeth ; 6 series of 

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

 Gill-rakers very short, 12 on lower part of anterior arch. 



Dorsal xv 13 ; spines equal in length from the seventh, which is I 

 length of head ; longest soft rays -J- length of head. Anal iii 9 ; 3rd 

 spine nearly as long as longest dorsal, Pectoral length of head, not 

 reaching vertical of origin of anal. Ventral barely reaching vent. 

 Caudal rounded. Caudal peduncle as long as deep. Scales with 

 feebly denticulated border, 34 j|; lateral lines ff. 



Brownish above, yellowish beneath ; dorsal with round black spots 

 between the soft rays. 

 Total length 110 millim." 

 From Lake Ngami Basin (Okovango River). (R. B. Woosnam). 



22. *TlLAPIA JALLAE, Blgl'. 



Chromis jallae, Bouleng., Boll. Mus. Torin., xi, 1896, p. 260. 



Tilapia jallae, Bouleng., Proc. Zool. Soc., 1899, p. 123, and Freshw. 

 Fish. Africa, iii, p. 213 (1915) ; Pellegr., Mem. Soc. Zool. France, xvi, 

 1904, p. 329. 



" Depth of body 3 times in total length, length of head 3 times. 

 Snout a little longer than eye, which is 3^ times in length of head and 

 ll times interorbital width ; mouth not extending to below anterior 

 border of eye ; teeth small; 6 or 7 series of scales on the cheek. Gill- 

 rakers shoi't, 9 on lower part of anterior arch. 



Dorsal xv 10 ; spines subequal from the fifth, which measures ~ 

 length of head ; last soft rays prolonged into filaments. Anal iii 8 ; 

 third spine as long as longest dorsal. Pectoral | length of head. 

 Caudal truncate. Caudal peduncle 1| times as long as deep. Scales 

 cycloid, 33 1, lateral lines -f-^ 



Olive-brown, with traces of five darker bars. 



Total length 75 millim. 



Upper Zambesi (district of the Victoria Falls)." 



23. *TILAPIA. GIARDI, Pellegr. 



Pellegr., Mem. Soc. Zool. France, xvi, 1904, p. 341, pi. v, fig. 2 

 Bouleng., Freshw. Fish. Africa, iii, p. 221, fig. 144 (1915). 



" Depth of body equal to length of head, 2| times in total length. 

 Upper profile of head curved ; snout shorter than postocular part of 

 head ; eye 3^ times in length of head ; mouth ^ width of head, extend- 



