DISCOGNATHUS. 185 



Discognathus johnstonii is a very close ally of the preceding species, differing in 

 the less projecting snout, the broader mouth, and the less developed upper lip devoid 

 of a fringe. 



A specimen 85 millim. long, obtained by Mr. A. B. Percival in the Nairobi River, 

 Kilimanjaro, at an altitude of about 6000 feet, with specimens of D. dembeenszs, 

 agrees very closely with the Lake Victoria specimen, and probably belongs to the 

 same species. 



3. DISCOGNATHUS VINCIGUERILE. 



(Plate XXXI. fig. 4.) 

 Boulenger, Proc. Zool. Soc. 1901, ii. p. 160, 



Body feebly compressed, its depth four and a half to five and a half times in the 

 total length. Plead moderately depressed, once and a half as long as broad, measuring 

 one-fourth the total length ; snout rounded ; interorbital region nearly flat, its width not 

 quite half the length of the head ; eye lateral, but better visible from above than from 

 below, in the middle of the length of the head, its diameter three and a half times in 

 the length of the head and once and two-thirds in the interorbital width ; width of the 

 mouth about one-third the length of the head ; upper lip well developed, bordered by 

 papillae forming a fringe; lower lip forming a mental disk, which is about as long as 

 broad ; two barbels on each side, measuring three-fifths the diameter of the eye. 

 Dorsal fin with 10 rays, 7 of which are branched, equally distant from the centre or the 

 posterior border of the eye and from the root of the caudal ; first branched ray longest, 

 as long as the head. Anal fin with II 5 rays, first branched ray longest, about two-thirds 

 the length of the head. Pectoral fin nearly as long as the head, widely separated from 

 the ventral, which is situated below the posterior half of the dorsal. Caudal fin deeply 

 emarginate. Caudal peduncle as long as deep. Scales 35-38 ^f, 3 or 3J between the 

 lateral line and the root of the ventral, 16 round the caudal peduncle. 



Yellowish, the scales on the back and sides finely speckled with brown, especially 

 towards the border ; a dark brown rhomboidal spot or vertical bar on the caudal 

 peduncle near the base of the caudal, and a more or less distinct dark bar on the base 

 of the firi; fins whitish, transparent. 



Total length 43 millimetres. 



Six specimens w r ere obtained in April 1900 by Mr. Loat in a pond left by the Nile 

 in the Third Cataract country about three miles north of Kermeh. The species did 

 not turn up again until two more specimens were found at Kaka, in the White Nile, 

 on April 17th, 1901. 



I), vinciguerrce, named after the distinguished Italian ichthyologist, Prof. D. Vinci- 

 guerra, who has much contributed to our knowledge of the fishes of North-east Africa, 



2b 



