ALESTES. 215 



slightly longer ; suout as long as or a little shorter than eye, which 

 is lateral and 2§ to 3-|- times in length of head; 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; 1G teeth (j) in upper jaw, 10 (tt) in lower; lower border ot 

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

 Sower part of anterior arch. Dorsal 11 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 



AS. 



little longer. Scales with radiating and anastomosing canals, 23-25 yf> 

 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 fin. 



Total length 150 millim. 



Gaboon, South Cameroon. 



1. Type. Gaboon. 



2-4. Ad. Kribi R., S. Cameroon. G. L. Bates, Esq. (C). 



19. ALESTES OPISTHOT^NIA. 

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



Depth of body 8 to 3^ times in total length, length of head i or 

 4j 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 '2% or 3 times 

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

 region convex, its width f or nearly J length of head ; maxillary 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. Gill-rakers moderately elongate, closely set, 20 to 

 23 on lower part of anterior arch. Dorsal II 8, originating 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 

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

 peduncle as long as deep. Scales with radiating and anastomosing 

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



o 



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



