TILAPIA. 245 



interorbital width, and a little exceeds least depth of prteorbital ; mouth 

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

 teeth small, in 4 or 5 series, 52 in outer series of upper jaw ; 5 or 6 

 series of scales on the cheek, width of scaly part equal to diameter 

 of eye. Gill-rakers short, 12 on lower part of anterior arch. Dorsal 

 XVIII 8; last spine longest, | length of head, f middle soft rays, 

 which are produced. Anal III 8; third spine nearly as long as last 



Fig. 103. 



Tihqjia zebra. 

 Type (P. Z. S. 1899). 



dorsal. Pectoral as long as head, not extending to vertical of origin 

 of anal. Ventral produced into a filament, extending beyond origin of 

 anal. Caudal rounded ("?), densely scaled at the base. Caudal peduncle 

 a little deeper than long. Scales finely denticulate, 31 jg-; lateral lines 

 j^^ ; scales on occiput, nape, breast, and belly very small. Grey, Avith 

 6 dark brown bars ; a crescentic dark brown band on the forehead, 

 from eye to eye, followed by a second farther back, and a third in 

 f)-ont of the dorsal ; vertical fins grey ; three round white spots on the 

 posterior pnrt of the anal ; ventrals blackish. 



Total length 105 millim. 



Lake Nyassa. 

 1. Tvpo. L. Nj'iis^a. Miss M. Woodward (U.) ; 



Miss S. 0. McK^nglilin (P.). 



