320 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 92 
margin of opercle pigmented; tip of lower jaw and upper lips with 
blackish pigment; tips of anterior dorsal rays white, then a diffuse 
blackish bar from middle of rays extends across dorsal fin to tips 
of last dorsal rays; base of dorsal pale; other fins pale; peritoneum 
silvery with scattered black pigment cells. 
Remarks.—This new species of Barilius is closest to B. steindach- 
neri Pellegrin and B. engrauloides Nichols. From stetndachneri it 
differs in the more backward position of the dorsal, as in that species 
the distance from origin of dorsal to midbase of caudal fin is a 
little greater than the distance from origin of dorsal to front of 
eye, and the distance from dorsal origin to midbase of caudal fin 
is a little greater than to occiput in B. silex. B. steitndachneri has 
38 to 40 scales and 11 to 13 branched anal rays instead of 42 scales 
and 10 branched anal rays in the new species. B. engrauloides has 
87 scales and 12 around the caudal peduncle instead of 42 and 14 re- 
spectively for B. stlex. The color pattern consisting of two rows 
of alternating blackish blotches, anteriorly, on B. stlex is a feature 
of the color pattern differing from any other species of Barilius, at 
least from western Africa. 
Named si/ex, meaning flint stone but once used as a “firestone,” in 
reference to the Smithsonian-Firestone Expedition to Liberia. 
MANNICHTHYS, new genus 
This new genus is characterized by its radiately striated scales, 
complete lateral line, two pairs of barbels; the simple rays of the 
dorsal and anal fins are weak, not enlarged and bony but cross- 
striated and close together; the pelvics are inserted about under the 
base of the first branched dorsal ray; the pharyngeal teeth are 5:3: 2- 
2:3:5 to 4:3:2-2:3:4; dorsal fin rays 111, 8; anal 111, 5; suborbitals 
narrow. 
The most important character of this new genus consists of the 
fine lines of papillae or pores, almost parallel, in groups on the sides 
of the snout, cheeks, opercular apparatus, between the dentary bones 
on lower jaw, and on dorsal anterior surface of head. In regard 
to the character of the parallel lines of pores this new genus resem- 
bles the Asiatic genera Cyclocheilichthys and Oreichthys Smith. It 
differs from the former genus in the absence of bony denticulated 
simple dorsal rays and from the latter in having two pair of barbels 
and a complete lateral line. 
This new genus differs from Barbus as applied to certain African 
cyprinids in having the lines of pores on the head. It traces through 
keys prepared by Boulenger, by Holly, and by Pellegrin on African 
fishes to the genus Barbus, but the species referred to that genus do 
not have the lines of pores on the head. 
