The Freshwater Fishes of South Africa. 483 



Dorsal xvi 12-13 ; last spine longest, about f length of head ; 

 longest soft rays a little more than ^ length of head. Pectoral a little 

 shorter than head, reaching to vertical of origin of anal. Ventral 

 extending to vent. Anal iii 11 ; 3rd spine about ^ length of head. 

 Caudal truncate ; caudal peduncle as long as deep or a little deeper 



than long. Scales cycloid, 31-^- ; lateral lines 21 y|?. 



Colour (of preserved specimens) dark brown above, lighter below ; 

 8 or 9 dark cross-bars on the body and a faint longitudinal streak 

 from opercle to base of caudal ; a dark opercular spot ; vertical fins 

 with faint dark and light spots forming oblique streaks ; a dark spot 

 at base of anterior rays of soft dorsal ; snout dark. 



Two specimens, 58 mm., 74mm. in length respectively, from Sawmills, 

 Bulawayo, Ehodesia (F. D. McKeau). 



This species closely resembles T. sparrmani, but the gill-rakers are 

 far more numerous and the scale formula and markings differ slightly. 



3. TILAPIA MOSSAMBICA, Peters. 



Chromis (Tilapla) mossambicus, Peters, Mou. Berlin. Ac., 1852, 

 p. 681. 



Chromis niloticiis, part., Peters, Arch. f. Nat., 1855, p. 267 ; Giiuth., 

 Cat. Fish., iv, p. 510 (1862) ; Peters, Eeise Mossanib., iv, p. 23, pi. iv, 

 fig. 4 (1868). 



Chromis mossambicus, part., Grunth., t.c., p. 268. 



Chromis dumerilii, Steindr., Verh. zool.-bot. G-es. Wieii, xiv, 1864, 

 p. 225, pi. vii, fig. 1. 



Chromis niloticus, var. mossambicus, M. Web., Zool. Jahrb., Syst. x, 

 1897, p. 148. 



Tilapia mossambica, Bouleug., Trans. Zool. Soc., sv, 1898, p. 4, Proc. 

 Zool. Soc., 1899, p. Ill, and Freshw. Fish. Africa, iii, p. 154, fig. 101, 

 (1915) ; Pellegr., Mem. Soc. Zool. France, xvi, 1904, p. 309. 



Tilapia dumerili, Bouleng., Proc. Zool. Soc., 1899, p. 116 ; Pellegr., 

 t.c., p. 317. 



Teeth in 4 (young) to 7 series. Depth of body 2^- to 3 times in total 

 length excluding caudal, length of head 2f to 3.} times. Head 1 T 7 ^ to 

 a little more than twice as long as broad, with concave upper profile ; 

 snout rounded, as broad as or a little broader than long, as long as or 

 a little shorter than postocular part of head ; eye 4 T 3 (young) to 6 

 times in length of head, f to f iiiterorbital width, equal to or a little 

 less than preorbital depth ; mouth large, T V to | width of head, extend- 

 ing to below anterior border of eye or not quite so far ; 2 to 4 series 



