BAEBUS. 19 



tttt 26-32 scales in lateral line; posterior barbel f-H 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-4^ times in 



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



Sc. 29-31 p, 3, 12 ; posterior barbel l|—l-§ 



diameters of eye ; depth of body 3-3| 



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



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



§ — 1J 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 II dia- 

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



total length 168. B. trispilopleura, Blgr., 



Sc. 26-30 3 -|#, 2-21 i 2 . posterior barbel f-1 



diameter of eye ; depth of body 3-3f 



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



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

 more than f- diameter of eye. 

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



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



Sc. 23-25 ff, 2, 8 ; depth of body J2f-3 times 



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



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



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



2. A single barbel on each side *. 



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



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



Sc. 32-36 ^||-% 3i-4i 12-14; mouth terminal 



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



4A 

 Sc. 28-31 5?, 3, 12 ; mouth inferior .... 175. B. afer, Peters, p. 778. 



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



Sc. 29-32 l\, l-li, 10 ; mouth terminal . . 176. B. magdalenm, Blgr., p. 179. 



31 

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



* 



Occasionally absent (B. magdalenm, B. rogersi). 



c2 



