124 MR. G. A. BOULENGER ON THE ArRICAKT AKD [Eeb. 7, 



« 



rays produced like the dorsals. Caudal truncate. Caudal pe 



I ; lat. 1. % 



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



brown, with traces of 5 darker bars. 

 Total length 75 millim. 

 Upper Zambesi (district of the Victoria Falls). 



30. TiLAPIA HUMILIS. 



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

 p. 763. 



Depth o£ body 3| in total length, length of head 31 times. 

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

 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 g length of 

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

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

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

 caudal with round blackish spots. 



Total length 115 millim. 



Angola. 



31. TiLAPIA &UINEENSIS. 



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

 (1862). 



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



Raligenes 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^ times. Snout deep, with 

 very steep upper profile, measuring about 1^ 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 border 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- 



3 



n 5 



duced. Caudal peduncle as long as deep. Scales cycloid, 31 

 lat. 1. jj^. 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. 



Ashantee. 



