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Show 118 MR. G. A. BOULENGER ON THE AFRICAN AND [FEB. 7, 16. TILAPIA PLEUROMELAS. Tilapia pleuromelas, A. Dum. Arch. Mus. x. 1859, p. 253. Tilapia lateralis, A. D u m . 1. c. Chromis pleuromelas, Giinth. Cat. iv. p. 271 (1862). Chromis lateralis, Giinth. t. c. 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. TILAPIA HEUDELOTI. Tilapia heudclotii, A. Dum. Arch. Mus. x. 1859, p. 254. Chromis heudclotii, Giinth. Cat. iv. p. 270 (1862). Depth of body a little more than twice in total length. 3 series of scales on the cheek. 16 gill-rakers on loAver part of anterior arch. Dorsal XIV 10. Anal III 7. Caudal rounded (?). Scales cycloid, 27-. BroAvnish; soft dorsal Avith irregular light and dark streaks. Total length 120 millim. Senegal. 18. TILAPIA SPARRMANI. Tilapia sparrmanii, Smith, HI. Zool. S. Afr., Fish. pi. x. (1840). Chromis sparmanni, Giinth. Cat. iv. p. 269 (1862). Chromis niloticus, part., Peters, Reise n.Mossamb. iv. p. 23 (1868). Teeth very small, in 3 to 5 series in both jaAvs. 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 1| to If in interorbital width; mouth moderate, J- Avidth 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, J- to | length of head, | to -| longest soft rays. Pectoral pointed, a little shorter than the head, not extending to origin of anal. Ventral 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 Q§YQ ; lat. 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 Falls to Namaqualand. |