TILAPIA. 213 



extending to between nostril and eye ; teeth in outer row rather large, 

 36 in upper jaw, with an 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 f length of head . 

 longest soft rays J length of head. Anal III 9 ; third spine nearly as 

 long as longest dorsal. Pectoral § length of head, not reaching vertica: 

 of origin of anal. Ventral barely reaching vent. Caudal rounded 

 Caudal peduncle as long as deep. Scales with feebly denticulated 

 border, 34 jg; lateral lines ^. Brownish above, yellowish beneath; 

 dorsal with round black spots between the soft rays. 



Total length 110 millim. 



Lake Ngami Basin. 



1- Type. Okovango R. E. B. Woosnam, Esq. (C). 



47. TILAPIA JALLJ*:. 

 Chromis jallw, Bouleno-. Boll. Mus. Torin. xi. 1896, p. 260. 



Tilapia jallw, Bonleng. Proc. Zool. Soc. 1899, p. 123 ; Pellegr. M(^m, Soc. Zool. 

 France, xvi. 190-4, p. .329. 



Depth of body 3^ times in total length, length of head S^ times. 

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

 1^ 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 short, 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 111 S ; third spine as long as 

 longest dorsal. Pectoral § length of head. Caudal truncate. Caudal 

 peduncle 1^ times as long as deep. Scales cycloid, 33 §; lateral lines ^y 

 Olive-brown, with traces of five darker bars. 



Total length 75 millim. 



Upper Zambesi (district of the Victoria Falls). — Type in Turin 

 Museum. 



48. TILAPIA HUMILIS. 

 Chromis humilis, Stelnd. Verb, zool.-bot. Ges. Wien, xvi. 1866, p. 763. 

 Tilapia humilis, Bouleng. Proc. Zool. Soc. 1899, p. 124 ; Pellegr. Mem. Soc. Zool. 

 France, xvi. 1904, p. 322. 

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



