250 



CICHLID^E. 



regular dark bars, which may be accompanied by large blackish spots ; a 

 dark opercular spot ; dorsal with oblique dark streaks and rows of small 

 pale spots, or with regular series of ocellar spots between the rays ; 

 caudal with small pale spots. 



Total length 140 millim. 



Lake Nyassa. 



L. Nyassa. Sir H. H. Johnston (P.). 



1. Type. 



2. One of the types of 



C. subocvlaris. 



3. Ad. 



Capt. E. L. Rhoades (P.). 



81. TILAPIA TETRASTIGMA. 



Chromis tetrastigma, Giinlh. Proc. Zool. Soc. 1893, p. C23, pi. liv. fig. G. 



Tilapia tetrastigma, Bouleng. TV. Zool. Soc. xv. 1898, p. 4. 



Tilapia johnstoni, part., Bouleng. Proc. Zool. Soc. 1899, p. 130. 



Astatotilapia johnstoni, part., Pellegr. Mem. Soc. Zool. France, xvi. 190-i, p. 303. 



Depth of body nearly equal to length of head, 2§ to 2£ times in total 

 length. Head twice as long as broad; snout rounded, with straight 



Fie. 168. 



lUfe** 



Tilapia tetrastigma. 

 Type, after Giinther (P. Z. S. 1893). f 



upper profile, as long as broad, as long as postocular part of head; eye 

 3 to 3£ times in length of head, equal to interoibital width, exceeding 

 prseorbital depth ; mouth rather small, f width of head, extending to 

 between nostril and eye ; teeth in 4 or 5 series, outer small, 56 to 60 in 

 upper jaw, separated by a considerable interspace from the others, 

 which are very minute and mostly conical ; 3 or 4 series of scales on the 

 cheek, width of scaly part less than diameter of eye. Gill-rakers short, 



