32 ]\Ir. G. A. Bouleiiger on 



Ilah. Ecuador {Uosenherg, Brit. Mus.); Santa Inez 

 {JIaensch, Brit. Mus.) ; Quito 'Brussels Mus.). 



Some two years ago the Britisli Museum purcliased from 

 Ilerr Ilaenscli what were S[)eciHed as cotypes of some of the 

 species described by Herr Breddin. Amongst them was tliis 

 species, labelled Prunasis analis, Bredd, ; but, as I can tind no 

 record of such a description, a mistake must have been 

 made. 



V. — On some West- African Species o/" Barb us. 

 By G. A. BouLENGER, F.R.S. 



The four species of which descriptions are here given have 

 sometimes been confounded. The large material at my disposal 

 enables me to give revised definitions of them by which their 

 distinction will be made easy. All four belong to the section 

 with two pairs of barbels and witli the last simple ray of the 

 dorsal fin neither strongly ossified and spine-like nor serrated. 

 Their principal characters may be thus contrasted : — 



A. Posterior barbel not longer than the eye and twice as long as the 



anterior. 



Depth of body 2J to 3 times in total lengtli ; 

 sq. 22-25 p, 2-2 1 between lat. 1. and 

 ventral B. afjiabes, Blkr. 



B. Posterior barbel once to twice as long as the eye, not twice as long 



as the anterior. 



Deptb of body 3 to 3f times in total length ; 



sq. 25-28 % 2^-3 between lat, 1. and 



ventral ; anterior barbel 1|, posterior 2 



diameters of eye B. trisjn'/us, lUkr. 



Depth of body 3 to 3g times in total length ; 



sq. 21-25 ''^, 2^-3 between lat. 1. and 

 ventral ; posterior barbel not longer than 

 the anterior, 1 to 1-i diameters of eye ; last 



simple ray of dorsal not enlarged JJ. camptacauthus, Blkr. 



Depth of body 3^ to 3^ times in total length ; 



sq. 24-27 ^^, 2A-3 between lat. 1. and 

 ventral ; posterior barbel longer than the 

 anterior, 1| to 2 diameters ot eye: last 

 simple ray of dorsal much thicker than 

 tirst branched ray B. ttaihiruSy Blgr. 



