. Bulletin of the British Museum (Natural History). A REVISION OF CERTAIN BARBUS SPECIES FROM AFRICA 167 (especially those >6o mm. S.L.) there is a pronounced nuchal hump ; this may be a populational character since it is more marked in some specimens from certain areas (e.g. northern Eusso Nyiro River near Thompson's Falls). Snout length 6-I-9-6 (M = 7-1), eye diameter 5-0-8-3 (negatively allometric), least interorbital width 9-0-I2-5 (M = 10-3). Length of anterior barbel I-4-5-9 (^^ = S'S). length of posterior barbel 3-5-9'8 (M = 57). Length of last unbranched dorsal ray highly variable a
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. Bulletin of the British Museum (Natural History). A REVISION OF CERTAIN BARBUS SPECIES FROM AFRICA 167 (especially those >6o mm. S.L.) there is a pronounced nuchal hump ; this may be a populational character since it is more marked in some specimens from certain areas (e.g. northern Eusso Nyiro River near Thompson's Falls). Snout length 6-I-9-6 (M = 7-1), eye diameter 5-0-8-3 (negatively allometric), least interorbital width 9-0-I2-5 (M = 10-3). Length of anterior barbel I-4-5-9 (^^ = S'S). length of posterior barbel 3-5-9'8 (M = 57). Length of last unbranched dorsal ray highly variable and possibly showing geographical correlation. For the species as a whole, length of dorsal spine is i3-8~247 (M = 18-5) ; populations with characteristic spine lengths are : Namango River, Longido district, Tanganyika Territory i8-8-23-o%, M = 22-4% (A^ = 4), S.L.'s 61-73 mm.; Kadam Mountain, Uganda, 20-5-22-8%, M = 21-4% (A'' = 6), S.L 's 59-74 mm.; a river flowing into Lake Baringo, Kenya, 22-4-24-4%, M = 23-2%, [N = 3), S.L.'s 40-44-5. The mean for aU 29 (31-70 mm. S.L.) other specimens from. Fig. 5. Barbiis amphigramma, drawn by Lavinia Buswell. various localities is 16-3% and the range i2-2-i9-i. The validity of this character as a population marker is still unestablished, particularly since the exceptional populations are each represented by so few specimens and because individuals of the former are amongst the largest known. Distance from snout-tip to dorsal orgin 49-0-55-0 (M = 52-3), length of pectoral fin I7-2-22-2. Caudal peduncle length 22-0-27-5 (M = 25-1), its depth 107-147 (M = 13-1). Lateral line with 33 (f.i), 34 (f.9), 35 (f.15), 36 (f.17), 37 (f.2) or 38 (f.i) scales, 6 (f.i), 6i (f.ii), 7 (f.23), 7* (f.4) or 8 (f.3) scales between the lateral line and the dorsal fin origin ; 3 (f.4), 3i (f.4), 4 (f.32), 4^ (f.3) or 5 (f.i) between the lateral line and the pelvic origin ; 14 (f.ii), 16 (f. 27) or 18 (f.3) scales around the caudal peduncle, 13-16 (mode 15) in