254 



CICHLID.*:. 



lines 



20-24 



TFTa* 



Brownish above, with a black band along each side of the 



back, from the nape, where it usually unites with its fellow in front of 

 tlie dorsal fin, to the caudal peduncle ; this band sometimes broken up 

 into spots ; a dark bar sometimes present between the eyes ; fins greyish 

 or brownish in females, dorsal with round red spots, darker in males, 

 in which the dorsal and anal are edged with yellowish. 



Total length 185 millim. 



Lake Nyassa. 



1. Skin, type. Lake Nyassa. Sir J. Kirk (0,). 



2-21. Ad., ligr., & yg. „ Capt.-E. L. Rhoades (P.). 



84. TILAPIA LETHRINUS. 



Chromis letlirlnus, Giinth. Proc. Zool. Soc. 1893, p. 622, pi. Iv. fig. A. 

 Tilapia letJirinvs, Rouleng. Tr. Zool. Soc. xv. 1898, p. 4, and Proc. Zool. Soc. 1899, 

 p. 129 ; Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 337. 



Depth of body equal to or a little greater than length of head, 2^ 

 to 2 1 times in total length. Head 2 to 2 J times as long as broad ; snout 

 with straight upper profile, longer than broad, as long as or a little 

 longer than postocular part of head ; eye 4 to 4^ times in length of 



Fig. 171. • 



Tilapia lethrinus. 

 Type, after Guntlier (P. Z. S. 1893). %. 



head, equal to interorbital width and less than preeorbital depth ; mouth 

 small, about J width of head, extending to between nostril and eye; 

 teeth very small, in 3 or 4 series, about 80 in outer series of upper jaw ; 

 3 or 4 series of scales on the cheek, width of scaly part equal to 



