B A REUS. 19 



tttt 2G-32 scales in lateral line; posterior barbel |-1^ diameters of 

 eye ; caudal peduncle not twice as long as deep ; mouth 

 terminal or subinferior. 

 Sc. 31-33 p, 2 ; posterior barbel a little longer 



than eye ; depth of body 3|-4^ times in 



total length 165. B. arcislomjce, Keilh., p. 169. 



Sc. 29-31 ^, 3, 12 ; posterior barbel li-l^ 



diameters of eye ; depth of body 3-3|^ 



times in total length 166. i?. luyz/mrw.'!, M. Web., p. 170. 



!Sc. 28-32 m, 2-3, 12-14 ; posterior barbel 



§—1^ diameters of eye ; depth of body 



2|-3^ times in total length 167. B. perince, Riipp., p. 170. 



Sc. 27-28 jl, 2, 12 ; posterior barbel U dia- 



meters of eye ; depth of body 3j times in [p. 172. 



total length 168. j5. trispilopleura, Blgr., 



Sc. 26-30 ^-|y% 2-2i 12; posterior barbel |-l 



diameter of eye ; depth of body 3-3| 



times in total length 169. B. nefjiectus, Blgr., p. 173. 



7. Base of ventral below anterior rays of dorsal ; posterior barbel not 



more than ;^ diameter of eye. 



3- 

 Sc. 29 o?, 2, 12 ; depth of body 3f times in 



total length 170. B. do(igetti, Blgr., p. 174. 



Sc. 23-25 % 2, 8 ; depth of body 2|-3 times 



in total length 111. B. congicus, Blgr., p. 174. 



Sc. 22-23 §, 2, 8 ; depth of body 3^ times in 



total length 172. B. pleuropholis Blgr., p. 175. 



2. A single barbel on each side *. 



a. Dorsal with 7 (rarely 6) branched rays. 



8- 

 Sc. 37-42 gx^i, 5-6, 18-20; mouth inferior . 173. B. asper, Blgr., p. 176. 



Sc. 32-36 ^-\P, 31-41, 12-14; mouth terminal 



or subinferior 174. B. anoplus, M. Web., p. 177. 



Sc. 28-31 |{, 3, 12 ; mouth inferior . . . . 175. ^. afer, Peters, p. 778. 



b. Dorsal with 8 branched rays ; barbel minute, if present. 



Sc. 29-32 gi, 1-1^, 10 ; mouth terminal . . 176. B. magdalence, Blgr., p. 179. 



Sc. 27-28 Ij, 2, 12 ; mouth inferior .... 177. B. rogersi, Blgr., p. 180. 

 * Occasionally absent {B. maydalence, B. royeni). 



?7 Bou l/ii 



