TJLAPIA. 107 



Scales not denticulate, 30-32 jj^^l ; lateral lines ^j^l^. Yellowish olive 

 above, whitish beneath; 8 or 9 dark brown cross-bands on the head and 

 back, not descending to the belly, the first between the eyes ; fins olive, 

 dorsal and anal with yellowish spots at the base ; a dark basal spot at 

 the origin of the soft dorsal. 



Total length 130 millim. 



Portuguese Guinea. 



1-6. Types. Geba R. at Bafata. Dr. W. J. Ansorge (C). 



7-9. Ad. Culufi R. above Bafata. 



34. TILAPIA ZILLII. 



Ace^'ina zillii, Gerv. Ann. Sc. Nat. (3) x. 1818, p. 203. 



Coptodon zillii, Gerv. Bull. Soc. Agric. Heranlt, 1853, p. 80, pi. iv. figs. 5-7 ; 



A. Duni. Arch. Mus. x. 1850, p. 252. 

 GhjpMsodon zillii, Val. C.H. Ac. Sc. xlvi. 1858, p. 713. 

 Ilaligenes tristrami, Giintli. Proc. Zool. Soc. 1850, p. 471, p1. ix. fig. B. 

 Chromis tristrami, part., Giinth. Cat. Fish. iv. p. 261) (1862). 

 Sarothe7'odon? zillii, Giinth. t. c. p. 274. 

 Chromis andrece, Giinth. Proc. Zool. Soc. 1864, p. 402 ; Lortet, Ann. Mus. Lyon, 



iii. 1883, p. 142, pi. viii. fig. 3; Tristr. Faun. Palest, pi. xvii. fig. 1 



(1884). 

 Clu'omis niloticus, part., Gerv. Zool. Pal. Gen. p. 205, pi. xlv. fig. 3 (1860), and 



Journ. de Zool. iii. 1874, p. 455. 

 Chromis inossamhicus, part., Steind. Sitzb. Ak. Wien, Ix. i. 1870, p. 23. 

 Chromis zillii, Sauv. Bull. Soc. Philom. (7) i. 1877, p. 163 ; Rolland, Rev. 



Scientif. (4) ii. 1894, p. 418, fig. 

 Chromis menzalensis, J. C. Mitch. Rep. Fish. L. Menzaleh, j). 13, pi. iii. (1805). 

 Chromis tristrami, Giinth. Proc. Zool. Soc. 1896, p. 218. 

 Tilapia tristrami, Bouleng. Tr. Zool. Soc. xv. 1808, p. 6. 

 Tilapia menzalensis, Bouleng. Proc. Zool. Soc. 1800, p. 110. 

 Tilapia zillii, Bouleng. 1. c. ; Pellegr. Mem. Soc. Zool. France, xvi. 1001, p. 327 ; 



Bouleng. Fish. Nde, p. 519, pi. xcii. (1007). 

 Ciiromis busumanus, Gunth. Proc. Zool. Soc. 1002. ii. p. 333, pi. xxx, 

 Tilapia busumana, Peilegr. t. c. p. 332. 



Depth of body 2J to 2f times in total length, length of head 2f to 3g- 

 times. Head If to 2 times as long as broad ; snout with straight or 

 slightly concave upper profile, a little broader than long, as long as or a 

 little shorter than postorbital part of head ; eye 3^ (young) to 5 times 

 in length of head, 1 (young) to 2 times in interorbital width, less than 

 prtcorbital depth in adult; mouth usually rather hirge, | to | width of 



1'* Bou II/III 



