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Show 132 MR. G. A. BOULENGER ON THE AFRICAN AND [Feb. 7, loAver part of anterior arch. Dorsal XVI 11; last spine longest, •| length of head, a little shorter than soft rays. Pectoral pointed, f length of head, not extending as far as origin of anal. Ventral reaching vent. Anal III 9 ; third spine a little shorter than last dorsal. Caudal rather deeply emarginate. Caudal peduncle \\ as long as deep. Scales with finely denticulate edge, 35 -^ ; lat. 1. |||^. Pale brown above, silvery white beneath ; five dark brown cross-bars, broken up into large spots ; a small dark brown opercular spot; a large brown spot at base of caudal; fins Avhite. Total length 105 millim. A single specimen from Lake Nyassa. Collected by Miss M. Woodward ; presented by Miss S. C. McLaughlin. 47. TILAPIA WILLIAMSI. Chromis ivilliamsi, Giinth. Proc. Zool. Soc. 1893, p. 624, pi. lvi. fig. C. Tilapia ivilliamsi, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. Teeth moderate, in 5 or 6 closely-set series in both jaws. Depth of body equal to length of head, 3 times in total length. Snout with slightly convex upper profile, lj diameter of eye, which is 4 times in length of head and lj in interorbital Avidth; mouth | width of head ; maxillary extending to beloAv anterior border of eye ; 4 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 10 on lower part of anterior arch. Dorsal XVII 8 ; last spine longest, nearly \ length of head, f longest soft rays. Pectoral obtusely pointed, \ length of head, not extending to origin of anal. Ventral reaching vent. Anal III 7 ; third spine a little shorter than last dorsal. Caudal rounded, basal half densely scaled. Caudal peduncle slightly longer than deep. Scales finely denticulate on the border, 31 ^7; no . lat. 1. -j. Dark brown, Avith scattered blackish spots; a blackish opercular spot; a round blackish spot at the root of the caudal; fins grey, dorsal broadly edged with black ; tAvo small round Avhite spots on the posterior part of the anal. Total length 105 millim. Lake Nyassa. 48. TILAPIA CALLIPTERA. Chromis caUipterus, Giinth. Proc. Zool. Soc. 1893, p. 623, pi. Iv. fig. B (1894) ; Bouleng. op. cit. 1896, p. 916. Chromis subocularis, part., Giinth. 1. c. p. 621. Ctenochromis caUipterus, Pfeffer, Thierw. O.-Afr., Fische, p. 19. Tilapia calliptera, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. Teeth small, in 3 to 5 series in both jaws. Depth of body 2| to 21 in total length, length of head 2 | to 3 times. Snout with straight upper profile, 1| to 1| diameter of eye, which is 3£ to 4 times in length of head and equal to or a little less than interorbital width ; mouth § to | width of head ; maxillary extending |
