188 



CHAEACINID.?:. 



1. BRYCON^THIOPS MICROSTOMA. 



Gunth. Ann. & Mag. K H. (4) xii. 1873, p. 143 ; Bouleng. Ann. Mus. Congo, 

 Zool. i. p. 82, pi. xxxvii. fig. 1 (1899), and Poiss. Bass. Congo, p. 145 (1901). 

 Brachyalestes mocquardianus, Thominot, Bull. Soc. Philom. (7) x. 1886, p. 167. 

 Bryconcefliiops houlengeri, Pellegr. Bull. Mus. Paris, 1900, p. 101. 



Depth of body 2f to ?)\ times in total length, length of head o\ to Sf 

 times. Head a little longer than deep, If to 2 times as long as broad; 

 snout broad, rounded, as long or a little shorter than eye, which is 2\ to 

 o\ times in length of head ; adipose eyelid much developed ; interorbital 

 width 2 to 2\ times in length of head ; maxillary extending to below 



2 



anterior border of eye or not quite so far; 14 teeth (bj in upper jaw, 



8 or 10 (-^) in lower ; lower border of second suborbital as long or a 

 little longer than diameter of eye. Gill-rakers slender, shorter than 

 gill-fringes, 15-17 on lower part of anterior arch. Dorsal II 8, nearer 

 occiput than adipose fin, its fifth ray above first of ventral ; longest ray 

 not longer than head. Anal III 17-20. Pectoral f to | length of head, 



Pig. 144. 



, ^' < ^ 



BrycoiKslMops microstoma, Tar. houlengeri. 

 Congo (A. M. C). 4. 



not reaching ventral. Caudal forked, with long pointed lobes. Caudal 

 peduncle 1| to If times as long as deep. Scales 35-40 f|, 3 between 

 lateral line and root of ventral. Silvery, back olive or dark blue, with 

 a dark vertical bar on each side above the pectoral, or (var. houlengeri) 



