FISHES FROM BRITISH EAST AFRICA. 673 



Swamp, The Eusso Mara is a tributary of the Eusso Nyiro. 

 The Saya is a separate river, between the Anagata Borita and the 

 Eusso Nyiro, flowing nortli and lost in a small swamp some 

 50 miles north of Eusso Nyiro. Unless otherwise stated, the 

 fishes here listed were obtained in the Eusso Nyiro, below the 

 falls. 



The fishes of this basin have much in common with those of the 

 Webi Shebeli and Juba, and nothing with those of Lake Rudolf. 

 Curiously, the small Barhus, B. nairohiensis and B. percivcdi, 

 previously discovered by Mr. Percival in the Nairobi (Athi River 

 system), on the east side of Kilimanjaro, were found again in 

 abundance in the Eusso Nyiro. 



1. MoRMYROPS DELiciGSUS Leach. 



2. MORMYRUS KANNUME Forsk. 



3. Labeo percivali, sp. n. (PI. LXXVIII.) 



Body strongly compressed, its depth 3^ to 3| times in total 

 length. Head 4 to 4| times in total length, 1| to 1| times as 

 long as broad ; snout rounded, g length of head; eye perfectly 

 lateral, 2| (young) to 3| times in length of head ; interorbital 

 width |, or a little over |, length of head ; lips with small papillae 

 forming transverse plicas ; lower lip with a fringe of large papillfe; 

 rostral flap moderately large, with entire or indistinctly denticulate 

 edge ; a small barbel in the corner of the mouth. Dorsal III 

 10-11, equally distant from end of snout and from root of caudal, 

 or slightly nearer the former ; upper edge concave ; last simple ray 

 in adult males much produced, twice, or nearly twice, as long as 

 head, not or but little longer than head in females and young. 

 Anal III 5, reaching or nearly reaching root of caudal. Pectoral 

 considerably longer than head in males, reaching base of ventral, 

 the first ray of which falls below fourth or fifth branched ray of 

 dorsal, shorter in females. Caudal deeply emarginate, with long, 

 pointed lobes. Caudal peduncle I5 to 1^ times as long as deep. 

 Scales 38-42 ^^,, 5 between lateral line and root of ventral, 

 18 round caudal peduncle. Silvery, back brownish grey; vertical 

 fins greyish. 



Numerous specimens, measuring 55 to 190 mm. 



Allied to L. oieumanni Blgr. Well distinguished by the larger 

 eye and the shape of the doi-sal in the males. 



4. Labeo cylindricus Peters. 



Also from the Eusso Mara and the Saya, and the Lorian 

 Swamp. 



5. Discognathus dembeensis Riipp. 

 Also from the Eusso Mara and the Saya. 



