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Show 120 "MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, Haligenes tristrami, Giinth. Proc. Zool. Soc. 1859, p. 471, pi. ix. fig. B. Chromis tristrami, part., Giinth. Cat. iv. p. 269 (1862). Sarotherodon (?) zillii, Giinth. Cat. iv. p. 274. Chromis andrece, Giinth. Proc. Zool. Soc. 1864, p. 492; Lortet, Ann. Mus. Lyon, iii. 1883, p. 142, pi. viii. fig. 3 ; Tristram, Faun. Palest, pi. xvii. fig. 1 (1884). Chromis niloticus, part., Gervais, Zool. Pal. Gen. p. 205, pi. xiv. fig. 3 (1869), and Jouru. Zool. iii. 1874, p. 455. Chromis mossambicus, part., Steind. Sitzb. Ak. Wien, lx. i. 1870, p. 23. Chromis zillii, Salvage, Bull. Soc. Philom. (7) i. 1877, p. 163 ; Rolland, Rev. Scientif. (4) ii. 1894, p. 418. fig. Chromis tristrami, Giinth. Proc. Zool. Soc. 1896, p. 218. Tilapia tristrami, Bouleng. Tr. Zool. Soc. xv. 1898, p. 6. Teeth in 3 or 4 series in both jaws, outer rather large. Depth of body 2| to 2 | in total length, length of head 2 | to 3| times. Snout with straight upper profile, 1| to If diameter of eye, which is 3| to 4| in length of head and 1 to 1\ in interorbital width ; mouth moderate, f- to § width of head; maxillary extending to below anterior border of eye; 3 or 4 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 8 to 10 on lower part of anterior arch. Dorsal X I V - X V 10-13 ; last spine longest, \ to \ length of head ; middle soft rays produced in adult specimens, about twice as long as last spine. Pectoral pointed, as long as the head or a little shorter, not extending to origin of anal. Ventral produced in the adult, reaching vent or anal. Anal III 7-9; third spine as long as or a little shorter than longest dorsal, soft rays produced like the dorsals. Caudal truncate. Caudal peduncle as long as deep. Scales mostly cycloid. 30-32 y^-rr ; lat. 1. 17-21 • • • jg^. Olive, with 6 to 8 more or less distinct darker bars, sometimes Avith a dark stripe along the middle of the side ; Arertical fins usually with more or less distinct lighter round spots ; a large round blackish spot usually present between the anterior soft rays of the dorsal; a dark opercular spot. Total length 210 millim. Algerian Sahara to Lake Rudolf and the Lake of Galilee l. Chromis faidherbi, Rochebr. Bull. Soc. Philom. (7) iv. 18S0, p. 167, and Act. Soc. Linn. Bord. (4) vi. 1883, p. 134, pi. v. fig. 5, from the Senegal, appears to be allied to C. zillii, but the description is insufficient and contradicted by the accompanying figure. D. X I V 11 ; A. Ill 7 ; Sq.'27f 3 dark bars on the body. 22. TILAPIA MAGDALEN^E. Chromis magdalence, Lortet, Arch. Mus. Lyon, iii. 1883, p. 146, pi. ix. fig. 2. 1 I have not seen Egyptian specimens ; but, according to Panceri (Rend. Ace. Sc, Soc. R. Nap. xii. 1873, p. 113), the species has been found in the artesian wells of the oases of the Libyan Desert by Figari Rey (Stud. sc. sulT Egitto, 1864, i. p. 287). |