Corlrrell — The Scales of the African Ci/pnnid Fishes. 143 



(2.) Neohola. N. argentea Pellegrin (Bugala, Lake Victoria, Br. E. 

 Bayon). Small transversely elongate scales about 2 mm. broad, 

 and not mnch more than 1 long; no evident angles; nuclear area 

 a little t)asad of middle; apical and basal radii, but very few and 

 feeble ; lateral circuli very widely spaced, abruptly separated (about 

 middle of side ) from apical ones. A weak scale of the same type 

 as that of Chehefhiops. It may be even better compared with 

 Barilius (EngrauUcypris) sardella from Lake Nyassa; this is a 

 slender fish with easily deciduous scales, wdiich are transversely 

 elongated, with the circuli as in Xeohola, but with better defined 

 apical radii. 



(o.) Barilius. The following key indicates in a general way the diag- 

 nostic characters of tlie scales of a numl>er of African and Asiatic 

 species. 



Large reddish scales with many apical radii 1. 



Smaller pallid scales 2. 



1. Scale much broader than long B. microlepis 



(Lake Xyassa; ./. E. S. Moore). 



Scale about as broad as long B. microcephalus 



(Lake Nyassa ; /. E. S. Moore). 



2. Scales with a few very strong radiating ribs (or in reverse, 



grooves), and in all things resembling those of Chela argen- 

 tea «^. 



Scales not thus marked 4. 



3. Intervals between the few apical radii broad . . . . B. gatensis 



(Wynad, F. Day). 

 Intervals between the ai)ical radii much narrower . B. canarcnsis 



(S. Canara, F. Day). 



4. Scales of a rather broad tyi)e ; basal radii strong; a central spot 



of dark pigment . . . B. l)eiidelisis (Simla, F. Day) and B. 

 coeaa (East Indian Company's collection). These fishes are 

 mnch alike. 

 Scales without a dark pigment spot 5. 



5. Thin scales of a rather or very broad type B. sardella 



(Lake Nyassa, E. L. IlJioades), B. uhangensis (Kribi River at 

 Efulon, S. Cameroon, Bates), B. neavil (mountain stream 

 near Petanke, N. E. Rhodesia, »S'. A. Neave). 



Scales not especially broad, basal radii absent or somewhat de- 

 veloped 0. 



G. African . . B. ?/ioo)'// (Snmba, Lake Tanganyika, C'!n;?;/H<//o?;; 

 not adult), B. loati (Gondokoro, W. L. S. Lout), Jl. kiiu/s- 

 leyiv (S. Cameroon, G. L. Hates). B. itiloticits also comes 

 in this group. 



Asiatic . . . B. iileo, B. andersoni, B. polylepis, B. goha, B. 

 harila, B. gutlalus, B. eagra, B. ornatus. 



