loO Cockerell-^Thc Srahs of the African CyprimJ Fhhcs. 



D. johnstoiil. Victoria Xyaiiza (Sir II. Johnston). Appparanre 

 of scale much a;^ in D. binnfordii, liut the hiterohasal angles have 

 wholly disappeared, and the broad nuclear area is broken up by a 



■ number of short irregular lines. The apical radii extend to the 

 side of the scale, where they are obliquely crossed by the circuli. 

 The lateral circuli are not so regular as in D. lamta. 



D. fjiiadrimaculains. Lake Zwai (Zaphiro). Scale much as in T). 

 hlanfordii. Laterobasal angles rudimentary ; nuclear area very far 

 basad ; apical radii extremely fine, the middle ones about oO m a]»art ; 

 lateral radii irregular and widely spaced, obliquely crossed by cir- 

 culi; apical circuli represented by scattered round tubercles. 



D. (lemheemis. Matti R. (Blue Nile) (P. C. Zaphiro). Thin scales 

 embedded in thick skin. Scales essentially as in qnadriviamlal <(.'<, 

 the nuclear area far basad. The short basal radii are well devel- 

 oped, and extend laterally in an irregular manner, so that tiie scale 

 is radiate all round. 



Thus, so far as the scales go, the genus DiscogncUhn.^ hangs well 

 together, and is separable from Varicorltinvx l)y the extreme close- 

 ness of the radii. 



( 10. ) Laheo. The scales of this large genus may be divided into a uum- 

 ber"of groups, as in IkirhHs. 



(a.) L. fimhriatus group. Scales very long, parallel-sided, rounded 

 apically, truncate basally; those oi fnnbrialns are aliout 1") nun. 

 long and 9 broad. A very distinctive group, api)roached, but not 

 nearly equalled, in Barbus by the group of i>. goiiionotuts. The 

 species are Asiatic, including L. cur.m, microphthalmns, kawrus, 

 gon'nis, fimbriates, bata, kontiiis, h'schnianltii ; and as a subgroup 

 with shorter scales L. dussninieri, pangnsia, chaJi/beatiis iuu\ nigri- 

 pinnis. The apical circuli are broken up into tubercles; the apical 

 radii diller, being much more innnerous in //. Jiala tlian iu L. 

 findiriatiis. One African species, L. barl/atus llouleuger ( llonui, 

 ]jower Congo) might be classed with the shorter-scaled division of 

 this grou]), but it is n-ally a rather narrow-scaled memlier of tiie 

 marrosloma grou[). 



(1).) L. 'laacrostoma group. Scales of the subipiadrate type, but not 

 much elongated ; basal margin obtusely lobed iu middle. I have 

 placed here the Asiatic L. calliasn and falcatns (dgi)rltilns), but the 

 latter is broader. The African species are numerous, including /.. 

 macrostoma, niloticus (few basal \-.\d\\) , annectms (but broader), 

 cylindricns, mesnps, vclifn- (large reildisli ^ca]('), forshalU, green it 

 and victoriavvs. The large scales of L. viclorianiis are badly in- 

 fested by some parasite. 



(c.) L. sladoni grouji. bike tiu' last, but no basal I'adii, and the 

 basal margin straight, or not obviously lobed. This group consists 



