256 



CICHLIDJE. 



rather deeply emarginate. Caudal peduncle 1\ times as long as deep. 

 Scales finelv denticulate, 34-35 -rr-; lateral lines 



23-24 



ia-21 • 



Pale brown 



above, silvery white beneath ; five dark brown cross-bars, broken up 



Pig. 172. 



Tilapia rostrata. 

 Type (P. Z. S. 1899). 



into large spots ; a small dark brown opercular spot ; a large dark 

 brown spot at base of caudal ; fins white, dorsal sometimes with small 

 round dark spots. 



Total length 210 millim. 



Lake Nyassa. 



1. Type. L. Nyassa. Miss M. Woodward (C.) ; 



Miss S. C. McLaughlin (P.). 



2. Ad. „ Prof. J. E. S. Moore (C). 



86. TILAPIA DAB.DENNII. 

 Bouleng. Tr. Zool. Soc. xv. 1899, p. 92, pi. xx. fig. 1, Ami. Mas. Congo, Zool. i. 

 p. 150, pi. lv. fig. 2 (1900), and Poiss. Bass. Congo, p. 472 (1901) ; Pellegr. 

 Mem. Soc. Zool. France, xvi. 1901, p. 342 ; Bouleng. Tr. Zool. Soc. xvii. 

 1906, p. 572. 



Depth of body 2f to 3^ times in total length, length of head 3 to 3i 

 times. Head 2 to 2j times as long as broad, with strongly curved 

 upper profile ; snout rounded, as long as broad or a little broader than 

 long, as long as or a little longer than postocular part of head, 1 to 1| 

 times as long as eye, which is 3j to 3J times in length of head, equals 

 or nearly equals interorbital width and exceeds least prseorbital depth ; 

 mouth moderate, f to § width of head, extending to between nostril 

 and eye ; teeth small, in 4 or 5 series, 50 (young) to 68 in outer series 



