TILAPIA. 215 



interorbital width, equal to depth of prseorbital ; mouth extending to 

 between nostril and eye, extremity of maxillary exposed ; outer teeth in 

 both jaws large, obtusely bilobed, 20 (young) to 38 in upper jaw, 

 followed after a wide interspace by a few minute tricuspid teeth arranged 

 in 2 or 3 transverse series ; 5 or 6 series of scales on the cheek, the 

 vertical diameter of the scaly part below the eye equal to diameter of 

 latter. Gill-rakers rather short, the larger anvil-shaped, 11 or 12 on 

 lower part of anterior arch. Dorsal XIV— XV 14-16 ; spines increasing 

 in length to the last, which measures \ to f- length of head ; longest 

 soft ray f to \ length of head. Anal III 10-11 ; third spine longest, 

 stronger but shorter than longest dorsal. Pectoral as long as or 

 a little shorter than head, not reaching vertical of origin of anal. 

 Ventral produced into a long filament, reaching origin of anal or 

 beyond. Caudal rounded, scaly all over in the adult. Caudal 

 peduncle deeper than long. Scales not or but very feebly denticulate, 

 29-32 jpil ; lateral lines -jpjjr. Grey or brown, with seven or eight 

 broad black vertical bars descending to the mid-ventral line, the first 

 passing through the eye, the last on the caudal peduncle ; pectoral 

 greyish, other fins blackish. 



Total length 210 millim. 



Liberia and Portuguese Guinea. — Types in Leyden Museum. 



1-7. Types of T. ansorgii. Culufi R. above Bafata, Dr. W. J. Ansorga 



Portuguese Guinea. (<'.). 



8-10. „ Geba R. at Bafata, Portu- „ 



guese Guinea. 

 11. Skel. 



12-14. Hgr. & yg. Gam Besse, Corbal 1\., „ 



Portuguese Guiuea. 



50. TILAPIA FASCIATA. 



Chromis fasciatus, Perugia, Ann. Mus. Genova, (2) x. 1892, p. 9 70. 

 Tilapia monteiri, Bouleng. Proc. Zool. Soc. 1899, p. 133. 



Tilapia fasciata, Bouleng. 1. c., and Poiss. Bass. Congo, p. 465 (1901) ; Pellegr. 

 Mem. Soc, Zool. Fiance, xvi. 1904, p. 339. 



Depth of body equal to length of head, 2^ to 3 times in total length. 

 Head twice as long as broad ; snout with straight upper profile, as long 

 as broad, as long as postocular part of head, as long as or a little longer 

 than eye, which is 3 to 3^ times in length of head, slightly exceeds 

 interorbital width, and considerably exceeds depth of prseorbital ; mouth 

 rather large, § to f width of head, extending to below anterior border 



