ALESTES. :^15 



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

 is lateral and 2f to 3-^ times ia 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; 16 teeth (g-) in upper jaw, 10 (|) in lower; lower border of 

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

 lower part of anterior arch. Doi-sal 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 p' 

 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. T^'pe. Gaboon. 



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



19. ALESTES OPISTBOT^ENIA. 

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



Depth of body 3 to 3-^ times in total length, length of head 4 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 2| or 3 times 

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

 region convex, its width |- or nearly ^ length of head ; m^ixillary not 



D 



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



Q 



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 jast behind 

 veitical of base of veutrals, 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 p, 2 between lateral line and ventral. Silvery, brownish 

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



