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Show 114 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, cycloid, 31-34 ^k. iat. 1. j|^I Brownish or olive, uniform or with darker spots at the bases of the scales: young with more or less distinct dark bars on the body, oblique streaks on the soft dorsal and anal, and two or three bars across the caudal; opercular spot usually very indistinct. Total length 180 millim. East and South-east Africa, from the coast of Zanzibar to Natal. 8. TILAPIA GALIL^EA. Sparus galilceus, Artedi, in Hasselq. Beise Palsest. p. 389 (1762). Chromis ?galilceus, Giinth. Cat. iv. p. 273 (1859). Chromis niloticus part., Giinth. 1. c. p. 267, and Proc. Zool. Soc. 1864, p. 490, and in Petherick, Trav. C. Afr. ii. p. 216 (1869); Steind. Sitz. Ak. Wien, lx. 1870, p. 964, pi. iv. fig. 1. Chromis niloticus, Steind. Verh. zool.-bot. Ges. Wien, xiv. 1864, p. 226 ; Tristram, Faun. Palest, pi. xviii. fig. 1 (1884). Chromis tiberiadis, Lortet, Ann. Mus. Lyon, iii. 1883, p. 135, pi. vi. Chromis microstomas, Lortet, 1. c. p. 139, pi. viii. fig. 1. Teeth very small, in 4 to 6 series in both jaws. Depth of body 2 to 2\ times in total length, length of head 2 | to 3 times. Snout with straight or convex upper profile, \\ to 1| diameter of eye, Avhich is 4 to 5 times in length of head and 1J to 2 in interorbital Avidth; mouth narrow, not more than \ Avidth of head, extending to below the nostril; 2 or 3 series of scales on the cheek, forming a narrow oblique band Avhich in its Avidest part does not exceed the Avidth of the naked praeopercle; large scales on the opercle. Gill-rakers short, 20 to 25 on lower part of anterior arch. Dorsal XVI-XVII12-14 ; last spine longest, \ to | length of head, | to § longest soft rays. Pectoral falciform, 1^ to If length of head, extending to origin of anal or beyond. Ventral reaching vent or origin of anal. Anal III 10-11; third spine as long as or a little shorter and stronger than last dorsal spine. Caudal truncate or slightly notched. Caudal peduncle deeper than long. Scales cycloid, 31-34 ^-.; lat. 1. J^=|. Brownish or olive, without spots or bars ; a more or less distinct dark opercular spot; vertical fins greyish or broAvn, without markings. Total length 300 millim. Lake of Galilee and Jordan, Nile, Senegal, Niger. 9. TILAPIA MICROCEPHALA. Chromis microcephalus (Bleek.), Giinth. Cat. iv. p. 272 (1862). Melanogenes microcephalus, Bleek. Nat. Verh. Vet. Haarlem, xviii. 1863, no. 2, p. 37, pi. vi. fig. 1. Teeth very small, closely set, in 4 or 5 series in both jaws. Depth of body 2 to 21- times in total length, length of head 24 to 3 times. Snout with straight or convex upper profile, 1| to 1^ diameter of eye, Avhich is 3| to 4 times in length of head and 14 |