4 CYPEINID^E. 



Sc. 33-36 p^' ^ ; posterior barbel If t° 2. 

 diameters of eye ; interorbital width 3 to Be- 

 times in length of head ; lower lip not form- 

 ing a median lobe 6. B. rueppelli, Blgr., p. 25. 



7. 27-39 scales in lateral line, 2|-3i between lateral line and ventral §, 

 12-14 round caudal peduncle ||. 

 * Interorbital width 21 to 3 times in length of head If. 



t Depth of body much greater than length of head, 2% to 3A times 

 in total length ; posterior barbel usually longer than eye. 

 Sc. 31-39 !|^|, 3-1 ; dorsal with 9 (rarely 8 



-■3 "2 



or 10) branched rays, its spine usually as 



long as head or longer ; posterior barbel 



1 to 1\ diameters of eye 7. B. hynni, Forsk., p. 2G. 



Sc. 32-34 ^p^, 2\ ; dorsal with 9 branched 



rays, its spine longer than head ; posterior 



barbel a little longer than eye 8. B. ruspolii, Vincig., p. 23. 



Sc. 30-35 JJf, 21 ; dorsal with 9 branched 



rays, its spine shorter than head ; posterior 



barbel 1 (young) to 2 diameters of eye, 



much longer than anterior 9. B. erlangerl, Blgr., p. 29. 



Sc. 30 S , 3 ; dorsal with 8 branched rays, its 



spine as long as head ; posterior barbel 1? 



diameters of eye, scarcely longer than an- 

 terior 1 10- -B. kassamensis, Blgr., p. 30. 



Sc. 29-33 *#, 2^-3 ; dorsal with 9 (rarely 8) 



branched rays, its spine shorter than head 



in adult ; posterior barbel 12-2 diameters 



of eye, as long as or a little longer than 



anterior 11- B. duchesnii, Blgr., p. 31. 



Sc. 27-28 1|, 2| ; dorsal with 8 branched rays, 



its spine longer than head in adult . . .12. B. occidentalism Blgr., p. 32. 



tf Depth of body equal to or a little greater than length of head, 

 3 to 4 t \ times in total length ; posterior barbel not longer than 

 eye ; spine of dorsal shorter than head. 

 Sc. 32-30 1|, 3-31 ; dorsal with 8 (rarely 9) 

 branched rays ; snout projecting consider- 

 ably beyond mouth 13. B. lohogenys, Blgr., p. 33. 



§ Exceptionally 4 in B. bynni, 2 in B. raddiffii. 



|| Exceptionally 16 in B. bynni. 



If Exceptionally 3| times in B. margaritce. 



