342 Annals of the South African Museum. 



where it becomes quite black ; top of head chestnut-brown ; dark 

 specks on dorsal and caudal fins. 



One specimen, 103 mm. in length, from Kafue Eiver, Upper 

 Zambezi (J. Drury). The specimen closely resembles A. laterally, 

 but the depth of the body does not equal the length of the head. 



It is also reported from Katanga (Lake Dilolo), Zululand and 

 Natal. 



4. MICKALESTES. 



Braclnjalestcs, part., Giinth., Cat. Fish, v., p. 314 (1864). 

 Micralestes, Bouleng., Ann. Mus. Congo, Zool, i., p. 87 (1889). 



Teeth pluricuspid, simply compressed, in 2 series in the upper 

 jaw. Dwarfed Alestes. 



Key to Species. 



Dorsal originating above base of ventrals. 



A. iii 16-17 ; scales 28-30 ; gill-rakers 12-15 ; inner pre- 



maxillary teeth inserted immediately behind outer I. M. acutidens. 



Dorsal originates immediately behind vertical of base of ventrals. 



A. iii 15-17 ; scales 28-30 ; gill-rakers 14 2. M. huinilix. 



MICRALESTES ACUTIDENS, Peters. 

 Alestes acutidens, Peters, Mon. Berl. Ak., 1852, p. 276. 

 Brachyalestes acutidens, Giinth., Cat. Fish, v., p. 316 (1864). 

 Micralestes acutidens, Bouleng., Ann. Mus. Congo, Zool., i., p. 87 

 (1899), and Cat. Fresh. Fish. Africa, i., p. 224 (1909). 



Teeth, 14 in upper jaw (), 10 in lower (f) ; inner premaxillary 

 teeth inserted directly behind the outer. Depth of body equals, or 



FIG. 15. Micralestes acutidens. 



nearly equals, the length of head, and is 3f to 4| times in total length 

 excluding caudal. Head 2 to 2^ times as long as broad, a little 

 longer than deep, with nearly straight upper profile ; lower jaw 

 slightly longer than upper ; snout f- to diameter of eye, which is 

 2f to 3J times in length of head and slightly longer than interorbital 

 width ; lower border of 2nd suborbital not longer than eye ; maxillary 



