from tlw Qu'inzu and Bciii/o Rivers. 553 



This species ami the ijrccediiiu: are closely related, and 

 constitute an isohited grou[), owing to the presence of a single 

 barbel combined with the characters of the allies of D. bynni. 



25. Darhus lucius, sp. n. 



Depth of body 4.\ to 4i times in total length, lenj=;th of 

 head >\\ to 3^ times. Head nearly 3 times as long as broad; 

 snout roumlcd, 3 to 3j times in length of head; eye 3^ 

 (young) to 5 times in length of head, interorhital width !• to 

 44 times ; mouth terminal, or lower jaw projecting, its width 

 3^ to 4 times in length of head; lips rather strongly 

 developed, not extending across chin ; two barbels on each 

 side, the anterior very minute, the posterior about j diameter 

 of eye. Dorsal III O-IO, ecjually distant from eye and from 

 caudal, border feebly concave, last simple ray strong, bony, 

 not serrated, ^ to § length of head. Anal III 5, not reaching 

 caudal. Pectoral h to j.^ length of head, not reaching ventral ; 

 latter below anterior soft rays of dorsal. Caudal peduncle 

 nearly twice as long as deep. Scales finely striated longi- 

 tudinally, 43-47 ^CL 3 between lateral line and ventral, 

 16 round caudal peduncle. Silvery, back brownish, fins 

 orange. 



Three specimens, measuring 55 to 230 mm., from the 

 Lucalla River at Luealla. 



This species also occupies an isolated position in the 

 B. bynni division. 



2G. Barbus mattozi, Guimaraes. 



Lucalla River. 



Stands very near B. argenteus, Gthr. 



27. Barbus eutania, Blgr. 

 Quanza River at Dondo. 



28. Barbus kesslen, Stdr. 

 Lucalla River and Lake Kilunda. 



29. Barbus holotania, Blgr. 

 Lucalla and Bengo Rivers. 



30. Barbus unitceniatus, Stdr. 

 Lucalla and Bengo Rivers, Lake Kilunda. 

 Ann. (0 Maij. A'. Hist. Ser. 8. Vol. vi. 37 



