BAKBUS. 19 



tttt 26-32 scales in lateral line; posterior barbel f-l£ 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 3f-4i times in 



total length 165. B. arcislongce, Keith., p. 169. 



Sc. 29-31 f v 3, 12 ; posterior barbel l|-li 



diameters of eye ; depth of body 3-3£ 



times in total length 166. B. vivipurus, M. Web., p. 170. 



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



Q—i-l diameters of eye ; depth of body 



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



Sc. 27-28 ||, 2, 12 ; posterior barbel 1^ dia- 

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



total length . 168. B. trispilopleura, Blgr., 



Sc. 26-30 %~; 2-2£, 12; posterior barbel f-1 



diameter of eye ; depth of body 3-3f 



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



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



more than | diameter of eye. 



3- 

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



total length 170. B. doggetti, Blgr., p. 174. 



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



in total length 171. B. congicus, Blgr., p. 174. 



2- 

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



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



2. A single barbel on each side *. 



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



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



Sc. 32-36 "H"*, H-ik, 12-14; mouth terminal 



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



Sc. 28-31 |L 3, 12 ; mouth inferior .... 175. B. a/er, Peters, p. 778. 



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



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



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



* Occasionally absent (B, magdalence, B. royersi). 



