TILAPIA. 



181 



edged with bright yellow, the former with round red spots forming 

 regular series between the rays ; caudal with small round red spots. 



Total length 240 millim. 



Lake Nyassa. 



1-2. Types. L. Nyassa. Capt. E. L. Rhoades (P.). 



3. Skel. 



21. TILAPIA LEPIDURA. 



Bouleng. Proc. Zool. Soc. 1899, p. 116, and Poiss. Bass. Congo, p. 450 (1901) ; 



Pellegr. Mom. Soc. Zool. Franco, xvi. 1 904, p. 317. 



Depth of body 2| to '1\ times in total length, length of head 2| to 

 3 times. Head If to If times as long as broad ; snout with convex 



Fig. 116. 



AIL 





Tilapia Ittpidura. 

 Type, from Angola, -g-. 



upper profile, blonder than long, as long as or a little shorter than 

 postocular part of head; eye 3-| to 4 times in length of head, 1^ to 

 2 times in interorbital width, equal to or a little less than prseorbital 

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

 nostril and eye ; teeth extremely slender, in 4 series, SO to 88 in outer 

 series of upper jaw ; 2 or 3 series of scales on the cheek, width of scaly 

 part less than diameter of eye. Gill-rakers short, 17 to 20 on lower 

 part of anterior arch. Dorsal XVI 10-12 ; last spine longest, f to 



