370 Annals of the South African Museum. 



Sc. 28-30 , 2, 12 ; dorsal with 9 branched 



*S 

 rays, last simple ray segmented ; base 



of ventral below middle of dorsal ; lower 

 lip with a small mental lobe, lower jaw 

 rather sharp-edged ; posterior barbel f 

 to as long as eye 22. /,'. siricrxtra-, n. sp. 



(b) Loire)' lip continuous on cJiin, u'itlmiit lobe. 

 Sc. 28 |f, 2, 12 ; dorsal with 9 branched 

 rays, the anterior rays much elongate ; 

 lips thick ; posterior barbel J diameter 

 of eye '23. /,'. nitidortiiHx, Blgr. 



(c) T,oirt>r lip not extending Herons chin. 



* Lower jaw with an angular edge. 

 Sc. 30-32 ^., 2-3, 12; dorsal with 8-9 



J 2 



branched rays ; anal ii 5 ; caudal ped- 

 uncle 1J-1 times as long as deep . . 24. />'. rhotlesianus, Blgr. 



Sc. 30-31 1*, 2, 12 ; dorsal with 8 branched 

 rays ; anal iii 5 ; caudal peduncle not 

 longer than deep 25. B. victoria, Blgr. 



Sc. 30 5 r 3, 12 ; dorsal with 9 branched 

 rays; snout pointed, prominent; scales 

 large 2(5. B. juimitiis, Gilchr. and Thomp. 



Sc. 28-30 , 2-3, 12 ; dorsal with 9 



^2 



branched rays, last simple ray seg- 

 mented ; anal iii 5 27. /'. xalrieiixix, n. sp. 



** Lower jaw without angular edge. 

 Sc. 41-44 H?, 4-5, 16-18; dorsal with 9 



Og 



branched rays, last simple ray seg- 

 mented 28. B. seeberi, n. sp. 



Sc. 35 ||, 2*, 14 ; dorsal with 8 branched 



2 



rays, border straight or feebly concave ; 



caudal peduncle 1^ times as long as deep 29. Ii. fairlm'tnii'i, Blgr. 



Sc. 32 *-|, 2, 12 ; dorsal with 9 branched 

 rays, border concave ; caudal peduncle 

 slightly longer than deep 30. B. codriiifjlonii, Blgr. 



II. Exposed surface of scales with radiating canals which, as a rule, are very 

 numerous in the species with small scales and less numerous, or even 

 restricted to a few, in those with large scales ; dorsal fin with G-8 (rarely 9) 

 branched rays, anal with 5 (rarely 6). 



A. Last simple ray of dorsal enlarged, bony, forming a strong spine which is not 

 serrated behind ; two barbels on each side. 



Sc. 30-34 , 3-4, 14-16 ; dorsal with 8 (rarely 7) 



"2 



branched rays 31. B. trimaculatus, Peters. 



