124 ME. G. A. BOTTLENGER ON THE AFRICAN AND [Feb. 7, 



rays produced like the dorsals. Caudal truncate. Caudal pe- 

 duncle 1^ as long as deep. Scales cycloid, 33^ ; lat. 1. j^. Olive- 

 brovvu, with traces of 5 darker bars. 



Total leugth 75 millim. 



Upper Zambesi (district of the Victoria Falls). 



30. TiLAPIA HUMILIS. 



Ghromis humilis, Steind. Verb, zool.-bot. Ges. Wien, xvi. 1866, 

 p. 763. 



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

 Snout with straight upper profile ; diameter of eye 4| times m 

 length of head, equal to interorbital width ; maxillary not reaching 

 to below anterior border of eye ; 6 or 7 series of scales on the 

 cheek. Dorsal XV 10 ; last spine longest, about j length of 

 head ; longest soft rays not quite | length of head. Pectoral 

 ■| length of head. Anal III 8. Caudal rounded. Scales 30 ^ ; 

 lat. 1. j^. Yellowish brown ; a black opercular spot ; dorsal and 

 caudal with round blackish spots. 



Total length 115 millim. 



Angola. 



31. TiLAPIA GTTINEENSIS. 



Chromis guineensis (Bleek.), Giinth. Cat. iv. pp. 271 & 510 

 (1862). 



Cliromis tristrami, part., Giinth. t. c. p. 269. 



Haligenes guineensis, Bleek. Nat. Verb. Vet. Haarlem, xviii. 1863, 

 no. 2, p. 41, pi. vii. 



Teeth small, in 4 series in both jaws. Depth of body 2^ to 2| 

 in total length, length of head 3^ to 3 5 times. Snout deep, with 

 very steep upper profile, measuring about Ig diameter of eye, 

 which is 4 times in length of head and Ig in interorbital width ; 

 mouth large, | width of head ; maxillary extending to below 

 anterior boi'der of eye ; 4 series of scales on the cheek, forming an 

 oblique band the width of which at least equals the diameter of 

 the eye ; large scales on the opercle. Gill-rakers short, 12 on 

 lower part of anterior arch. Dorsal XV-XVI 11-12 ; last spine 

 longest, f to I length of head ; middle soft rays much produced, 

 nearly 3 times as long as last dorsal spine. Pectoral pointed, 

 a little longer than the head, not extending to origin of anal. 

 Ventral produced, reaching beyond origin of anal. Anal III 9 ; 

 third spine shorter than longest dorsal, soft rays produced like the 

 dorsals. Caudal feebly emarginate, the outer rays somewhat pro- 

 duced. Caudal peduncle as long as deep. Scales cycloid, 31 -^ • 

 lat. 1. ^^/-j-^. Dark olive ; vertical fins with some light spots, con- 

 fluent into two or three streaks on the dorsal ; a black opercular 

 spot. 



Total length 190 millim. 



Ashautee. 



