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Show 138 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, pointed, | length of head, not extending to origin of anal. Ventral reaching vent. Anal III 6; third spine as long as longest dorsals. Caudal truncate, densely scaled. Caudal peduncle a little longer than deep. Scales with finely denticulate border, 34 ^ ; lat. 1. §. Bright golden yellow, with three black stripes, one along the side of the body from the eye to the base of the caudal, a second above the upper lateral line from the occiput to the caudal peduncle, and a third along the dorsal fin ; two curved black bands across the snout from eye to eye ; a few black spots on the upper part of the caudal fin. Total length 75 millim. Lake Nyassa. 59. TILAPIA OLIGACANTHUS. Tilapia oliqacanthus, Bleek. Versl. Ak. Amsterd. ii. 1868, p. 309 ; Bleek. & Pollen, Poiss. Madag. p. 11, pi. iv. fig. 1 (1874). Pti/chochromis oliqacanthus, Steind. Sitzb. Ak. Wien, lxxxii. i. 1880, p. 249, pl.'i.; Sauvage, Hist. Madag., Poiss. p. 439, pis. xliv. fig. 4, xlivB. fig. 1, & xiv. fig. 1 (1891). Teeth in 3 series in both jaws, of outer row moderate, of inner rows very small. Depth of body 21- to 2\ in total length, length of head 2| to 3. Snout with straight or slightly convex upper profile, 11 diameter of eye, which is 3| to 4 times in length of head and equals interorbital width ; mouth moderate, § diameter of eye, extending to between nostril and eye ; 4 or 5 series of scales on the cheek : larger scales on the opercle. Gill-rakers short, 12 or 13 on lower part of anterior arch. Dorsal XIII-XIV 11-12 ; last spine longest, f to | length of head, § to f longest soft rays. Pectoral pointed, as long as the head or a little shorter, not extending so far as origin of anal. Ventral reaching vent or a little beyond. Anal III 8-9 ; third spine longer than last dorsal. Caudal with rather deep crescentic emargination. Caudal peduncle as long as deep. Scales with finely denticulate border, 32-34 ftl| • lat. 1. f^ff. Olive or broAvnish above, Avith five dark bars or 14-15 ' 1-s-lo two or three large dark spots on each side. Total length 135 millim. Madagascar. 60. TILAPIA MADAGASOARIENSIS. PtycJwchromis madagascariensis, Sauvage, Hist. Madag., Poiss. p. 442, pis. xliii. fig. 4 & xliv A. fig. 6 (1891). Teeth in 4 or 5 closely-set series, of outer TOAV moderate, of inner rows very small. Depth of body 2 to 24- in total length, length of head 3. Snout with straight or slightly convex upper profile, 1| to If diameter of eye, Avhich is 4 times in length of head and 1\ to lj in interorbital width; mouth moderate, | diameter of eye, extending to between nostril and eye ; 4 or 5 series of scales on the cheek ; larger scales on the opercle. Gill-rakers short, falciform, 12 on lower part of anterior arch. Dorsal X I H 10-13; last spine longest, | to f length of head; middle |