ALESTES. 215 



slightly longer ; sn(3ut as long as or a little shorter than eye, which 

 is lateral and 2|- to 3J times in length of liead; adipose eyelid scarcely 

 distinct; interorbital region feebly convex, its width 2 to 2^ times in 

 length of head; maxillary not extending to below anterior border of 

 eye; IG teeth (y-) in upper jaw, 10 (-,) in lowei- ; lower border of 

 second suborbital as long as eye. Gill-rakers rather long, 25-28 on 

 lower part of anterior arch. Dorsal II 8, originating immediately 

 behind vertical of base of ventral, a little nearer caudal than end 

 of snout; longest ray as long as head or a little longer. Anal III 

 15-17. Pectoral f length of head, reaching base of ventral. Caudal 

 forked, with pointed lobes. Caudal peduncle as long as deep or a 

 little longer. Scales with radiating and anastomosing canals, 23-26 y|' 

 2 between lateral line and root of caudal. Silvery, brownish on the 

 back ; a black streak along each side of the caudal part of the body, 

 extending on middle rays of caudal lin. 



Total length 150 millim. 



Gaboon, South Cameroon. 



1. Type. Gaboon. 



2-4. Ad. Kribi K., 8. Cameroon. G. L. Bates, Esp (C). 



19. ALESTES OPIST BOTHNIA. 

 Boideng. Proe. Zool. Soc. 1903, i. p. 22, pi. i. fig. 2. 



Depth of body 3 to o^ times in total length, length of head 1 or 

 4^^ times. Head If to 2 times as long as broad, a little longer than 

 deep ; snout a little shorter than eye, which is lateral and 2f or 3 times 

 in length of head; adipose eyelid very feebly developed ; interorbital 

 region convex, its wddth f or nearly J length of head ; muxillary not 

 extending quite to below anterior border of eye ; 16 teeth (g) in upper 

 jaw, 10 (j) in lower; length of lower border of second suborbital equal 

 to diameter of eye. Ciill-rakers moderately elongate, closely set, 20 to 

 23 on lower part of anterior arch. Dorsal II 8, orii^inating just behind 

 veitical of base of ventrals, a little nearer caudal than end of snout, 

 longest ray a little shorter than head. Anal III 13-15. Pectoral as 

 hmg as head, reaching ventral or nearly as far. Caudal forked. Caudal 

 peduncle as long as deej). Scales with radiating and nnastomosing 

 canals, 24-27 -^^ 2 between lateral line and ventral. Silvery, brownish 

 on the back ; a black humeral spot and a black lateral band, commencing 



