TILAPIA. 207 



long as or longer than eye, a little shorter than postocular part of head, 

 eye 3 (young) to 4J times in length of head, f to f interorbital width, 

 equal to or a little more than depth of prseorbital ; mouth moderate, 

 f to |- width of head, extending to between nostril and eye, or nearly to 

 below anterior border of latter ; teeth small, in 3 to 6 series, 40 (young) 

 to 80 in outer series of upper jaw ; 2 or 3 series of scales on the cheek, 

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

 9 to 12 on lower part of anterior arch. Dorsal XIII-XV 9-11 (very 

 rarely 12) ; last spine longest, f to f length of head ; longest soft rays 

 f to once length of head. Anal III 9-10 ; third spine a little shorter 

 but stronger than last dorsal. Pectoral a little shorter than head, rarely 

 just as long, not reaching vertical of origin of anal. Ventral reaching 

 origin of anal or beyond. Caudal rounded or rounded-subtruncate. 

 Caudal peduncle as long as deep or a little deeper than long. Scales 

 cycloid, 27-29 '^^i^ ; lateral lines g::f^. Pinkish brown to dark olive- 

 brown, the scales sometimes with greenish-yellow margins ; young with 

 seven to nine dark bars, which may persist^though feebly marked, in 

 the adult; a blue-black opercular spot; vertical fins with or without 

 yellow edge, with small dark spots, or dorsal and anal with oblique 

 darker and lighter stripes; a large blackish spot often present at the 

 base of the soft dorsal, between the anterior rays ; outer ventral rays 

 usually black. 



Total length 190 millim. 



Angola, Katanga, Lakes Mwcru and Bangwelu, and Zambesi to Orange 

 River and Natal. 



1-3. A<I. & yg. Fluilla, Angoln. Dr. Welwitscli (P.). 



4. Yg. Que K., „ Dr. W. J. Ansorge ((.'.). 



;")-(). Ad. L. Pem[)ere, Kataiign. ('apt. Leniaire (C). 



7-iS. Yg. I(. Pilolo, „ „ 



*). Ad. Kafiibo U , „ Dr. L. Stappers (C). 



10-11. Ad. L. Mweru at Pakalulvva. „ 



12— K"^. Y<'". ,, Lukonzolwa. ., 



14. Type of L. Bangwelu. F. li. Melland, Es(|., and 



7'. foiih»ii. Father Foulon (P.j. 



15-21. Ad. it yg. „ F. H. Melland, Esq. (P.). 



22. Ilgr. Ka/.ungula, Upper Zambesi. Kev. L. Jalla (C.) ; Turin 



Museum (P.). 



23. Ad. Mazoe, S. Phodesia. J. ff. Darling, Esq. (P.). 

 24-2.5. Ilgr. Umsitu K , Broken Hill, Uev. F. A. Rogers and 



S. lihodesia. E. r. Chubl), Esq. (P.). 



2(J-27. Ad. Okovaui^o P., lU'ar L. Nganii. K. B. Woosnani, Es(|. (<1). 



