118 ME. G-. A. BOULENGEK ON THE AEBICAjST AND [Feb. 7, 



16. TiLAPIA PLEUEOMELAS. 



Tilapia pleuromelas, A. Dum. Arch. Mus. x. 1859, p. 253. 



Tilapia lateralis, A. Dum. 1. c. 



Chromis pleuromelas, Glinth. Cat. iv. p. 271 (1862). 



Chromis lateralis, Giinth. t. e. p. 272. 



Depth of body about twice in total length. 2 series of scales on 

 the cheek, 15-17 gill-rakers on lower part of anterior arch. 

 Dorsal XIV 12-14. Anal III 10. Caudal rounded. Scales 

 cycloid, 26-29 ~. Brown ; a large black blotch on each side of 

 the body. 



Total length 200 millim. 



Senegal. 



17. TiEAPlA HEIJDELOTI. 



T'dapia heudelotii, A. Dum. Arch. Mus. x. 1859, p. 254, 



Chromis heudelotii, Giinth. Cat. iv, p, 270 (1862), 



Depth of body a little moi'e than twice in total length, 3 series 



of scales on the cheek, 16 gill-rakers on lower part of anterior 



arch. Dorsal XIV 10, Anal III 7. Caudal rounded (?). 



Scales cycloid, 27 ^. Browaiish ; soft dorsal with irregular light 



and dark streaks. 



Total length 120 millim, 

 Senegal. 



18. Tilapia sparbmani, 



Tilapia sparrmanii, Smith, 111. Zool. S. Afr., Fish, pi, v. (1840). 



Chromis sparmanni, Giinth. Cat, iv, p. 269 (1862). 



Chromis niloticits, part,, Peters, E-eise n.Mossamb. iv. p, 23 (1868), 



Teeth very small, in 3 to 5 series in both jaws. Depth of body 

 2^ to 2f times in total length, length of head 3 to 3|, Snout 

 with straight or slightly convex upper profile, as long as the eye, 

 which is 3| to 4 times in length of head and I5 to ]f in inter- 

 orbital width ; mouth moderate, |- width of head ; maxillary 

 extending to below anterior border of eye ; 2 series of scales on 

 the cheek ; large scales on the opercle. Gill-rakers very short, 

 10 to 12 on lower part of anterior arch. Dorsal XIII-XV 9-11 ; 

 last spine longest, f to | length of head, j to f longest soft rays. 

 Pectoral pointed, a little shorter than the head, not extending to 

 origin of anal, A^entral reaching origin of anal. Anal III 9 ; 

 third spine a little shorter but stronger than last dorsal spine. 

 Caudal rounded. Caudal peduncle as long as deep. Scales cycloid, 

 27-29 2ro5 ^at, 1, ^^. Pinkish to brownish, with 7 or 8 rather 

 indistinct dark brown or olive bars ; vertical fins with some small 

 dark spots ; a large blackish spot on the dorsal, between the anterior 

 soft rays ; a dark opercular spot. 



Total length 145 millim. 



South-west Africa, from Angola and the Victoria Palls to 

 Namaqualand. 



