182 



CICHLIDiE. 



| length of head. Anal III 8-9; third spine nearly as long as last 

 dorsal. Pectoral as long as or a little longer than head, reaching 

 vertical of origin of anal or not quite so far. Ventral reaching vent. 

 Caudal rounded, densely scaled. Caudal peduncle deeper than long. 

 Scales cycloid, 29-32 j^ ; lateral lines J^g. Brownish above, golden 

 yellow beneath ; blackish spots on the dorsal and anal, confluent into 

 oblique bands on the soft dorsal ; a wide-meshed blackish network on 

 the caudal, disappearing with age. 



Total length 190 millim. 



Angola, Congo. 



1. Typo. Angola. J. J. Monteiro, Esq. (C.). 



2. Type. Lower Congo. M. F. Hens (C). 



3. Hgr. Boma, Lower Congo. Mr. J. Paul Arnold (P.). 



4. Ad. Bolobo, Upper Congo. llev. G. Grenfell (P.). 



22. TILAPIA BOULENGEPJ. 



Pellegr. Bull. Mus. Paris, 1903, p. 121, and Mem. Soc. Zool. France, xvi. 1904, 

 p. 318, pi. v. fig. 3. 



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

 Upper profile of head descending in a strong curve ; snout rounded, 



Fig. 117. 



Tilapia boulengeri. 

 Type, after Pellegrin (Me'm. Soc. Zool. France, 1904). 



a little shorter than postocular part of head ; eye 4 times in length of 

 head, less than depth of pra?orbital ; mouth rather small, f width 

 of head, extending a little beyond nostril ; teeth in 6 series ; 2 series 

 of scales on the cheek. Gill-rakers short, 22 on lower part of anterior 

 arch. Dorsal XVI 12 ; last spine longest, i length of head. 



