. Bulletin of the British Museum (Natural History). 156 A REVISION OF CERTAIN BARBUS SPECIES FROM AFRICA Seven and a half to eight and a half (rarely 5 or 7) scales between the dorsal and pelvic fin origins ; 10-12 (mode 10) around the caudal peduncle ; 9-11 in the predorsal row. Origin of dorsal fin above the last few pelvic rays or even slightly behind the base of the pelvics ; dorsal with 3/7 rays, the last unbranched ray stout and serrated on its posterior face. Anal fin with 3/5 rays. Coloration in preserved material. Ground colour brownish-yeUow (greyish in formol- fixed fishes) ; scales
. Bulletin of the British Museum (Natural History). 156 A REVISION OF CERTAIN BARBUS SPECIES FROM AFRICA Seven and a half to eight and a half (rarely 5 or 7) scales between the dorsal and pelvic fin origins ; 10-12 (mode 10) around the caudal peduncle ; 9-11 in the predorsal row. Origin of dorsal fin above the last few pelvic rays or even slightly behind the base of the pelvics ; dorsal with 3/7 rays, the last unbranched ray stout and serrated on its posterior face. Anal fin with 3/5 rays. Coloration in preserved material. Ground colour brownish-yeUow (greyish in formol- fixed fishes) ; scales (especially the three or four midlateral rows) edged with black, particularly in adult males ; a silver midlateral streak from the opercular margin to the caudal base (often darkening to a thin black stripe) ; a weU-defined midlateral black spot at the caudal base, another at the anterior part of the anal base and a third, sometimes more diffuse spot at the base of the anterior dorsal rays. Anal fin colourless basaUy but often with a broad dark band at its margin ; dorsal hyaline but with a broad, obliquely and downwardly directed band on the upper half of the fin, the distal margin being clear. The base of the dorsal fin membrane is sometimes dark, giving the impression that the pigmentation is continued from the dark spot at the fin base. Caudal often edged with Fig. I. Barbus aphtirogramma. holotype, about (from Boulenger, Cat. Afr. Fish.). Coloration in live fishes (based on specimens from the Lake Victoria basin). Ground colour tarnished silver to golden-silver ; flank scales with dark margins. A dark spot at the base of the anal, caudal and dorsal fins. Dorsal and anal fins black but with an orange-red blotch at the centre. The caudal is outlined in black with the greater part of the membrane orange. Pectoral and pelvic fins orange. The intensity of this orange coloration appears to be related to the level of the fish's sexual activity and is most intense in
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