238 ZOOLOGICAL RESULTS OF THE RUWENZORI EXPEDITION. 
than the base of the caudal fin. Anal fin with 17 or 18 rays, twice as distant from the 
base of the ventral as from the caudal, and originating a long way behind the vertical 
of the dorsal. Pectoral fin 3 to 2 the length of the head, not reaching the ventral. 
Caudal forked, with pointed lobes. Caudal peduncle once and a half as long as deep. 
42-44 scales in a longitudinal series, 10 in a transverse series; 12 or 13 keeled scutes 
between the isthmus and the ventralis, 10 between the ventrals and the anal. Body 
yellowish, head and a broad lateral band silvery. 
Total length 72 mm. 
‘Two specimens from the Aruwimi River. 
Family CHARACINID&, 
9. BrycoNmTHIors microsroMa Gthr. 
Aruwimi River, Upper Congo. 
3. ALESTES MACROPHTHALMUS Gthr. 
Irumu River. 
4, ALESTES GRANDISQUAMIS Bler. 
Trumu River. 
5. MICRALESTES ACUTIDENS Peters. 
Trumu River. 
6. PrTersivs woosnami Bler. 
Bouleng. Ann. & Mag. N. H. (7) xx. 1907, p. 487 ; id. Cat. Afr. F. Fish. i. p. 239, fig. 183 
(1909). 
Depth of body equal to length of head, four times in total length. Head longer 
than deep, with convex upper profile ; lower jaw projecting slightly beyond the upper ; 
eye as long as the snout, three times in the length of the head; maxillary not extending 
to below the anterior border of the eye; 14 teeth (°) in the upper jaw, 8 in the lower ; 
outer premaxillary teeth tricuspid, inner multicuspid and inserted immediately behind 
the outer. Gill-rakers short, 12 on lower part of anterior arch. Dorsal fin with III 8 
rays, originating above the base of the ventrals and at equal distance from the end of 
the snout and from the root of the caudal fin; longest ray about } the length of the 
head. Adipose fin very small. Anal fin with II] 17-18 rays. Pectoral fin shorter 
than the head, not reaching the ventral. Caudal peduncle as long as deep. Scales 
29-30 et 2 between lateral line and ventral. No markings, except a silvery lateral 
band, which is black-edged above. 
Total length 70 mm. 
Two specimens from the Aruwimi River, Upper Congo. 
