The Freshwater Fishes of South Africa. 369 



'2. Ventral below anterior rays of dorsal. 

 (a) One or botli lips produced into median lobes. 



Sc. 42 =f , 4, 14 ; dorsal with 8 branched 



'2 

 rays, last simple ray segmented ; both 



lips produced into triangular lobes ; 



posterior barbel a little longer than eye 14. ]'. iiih-liristi, Blgr. 



Sc. 33-36 5 Y?, 2$, 14-16 ; dorsal with 8-9 



branched rays ; lower lip continuous 



across chin, often with a small rounded 



lobe ; posterior barbel as long as or 



slightly longer than eye 15. /;. boirkeri, Blgr. 



Sc. 30 ~, 2i, 14 ; dorsal with 9 branched 



rays, last simple ray segmented ; lower 



lip with a small mental lobe ; posterior 



barbel slightly longer than eye .. .. 16. /,'. robinxoni, n. sp. 



(b) Lower Up not extend-in ft across cJiin. 

 Sc. 35-37 ||, 3, 16 ; dorsal with 8 branched 

 rays ; lower jaw with a sharp edge and 

 sometimes with a small mental lobe ; 

 posterior barbel as long as or a little 

 shorter than eye 17. B. aureiis, Cope. 



3. Dorsal fin originating in advance of ventrals. 

 (a) One or both lips produced into median lobes. 

 Sc. 32-33 |J, 2, 14 ; dorsal with 8 branched 



rays ; ventral originating a little behind 



origin of dorsal ; both lips produced into 



long pointed median lobes ; posterior 



barbel as long as eye 18. B. lobnchilus, Blgr. 



Sc. 32-34 ||, 3, 12 ; dorsal with 9 branched 



rays ; base of ventral below middle of 



dorsal ; both lips produced into more or 



less pointed median lobes ; posterior 



barbel as long as eye 19. B. zainbesensis, Peters. 



Sc. 30-32 *|, 2-2, 12 ; dorsal with 9-10 

 branched rays ; base of ventral below 

 middle of dorsal ; both lips produced 

 into obtusely pointed median lobes ; 

 posterior barbel a little shorter than 

 eye 20. /,'. rJ/ilotes, Blgr. 



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

 branched rays, last simple ray seg- 

 mented ; base of ventral below middle 

 or anterior third of dorsal ; both lips 

 produced into obtusely pointed median 

 lobes posterior barbel a little shorter 



than eye , .. .. 21. B. i/ninuin/i, n. sp. 



27 



