from the Quanza and Ben go Rivers. 553 



This species and the preceding are closely related, and 

 constitnte an isolated group, owing to the presence of a single 

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



25. Barbies lucius, sp. n. 



Depth of body 4 J. to 4i times in total length, length of 

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

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

 (young) to 5 times in length of head, interorbital width 4 to 

 4^ 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 ^ diameter 

 of eye. Dorsal III 9-10, equally 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 -k to | 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- 

 tudinallv, 43-47 =f-=f. 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 Lucalla. 



This species also occupies an isolated position in the 

 B. bynni division. 



26. Barbus mattozi, Guimaraes. 



Lucalla River. 



Stands very near B. argenteus, Gthr. 



27. Barbus euttenia, Blgr. 

 Quanza River at Dondo. 



28. Barbus kessleri, Stdr. 

 Lucalla River and Lake Kilunda. 



29. Barbus holotcenia, Blgr. 

 Lucalla and Bengo Rivers. 



30. Barbus unitamiatus, Stdr. 

 Lucalla and Bengo Rivers, Lake Kilunda. 

 Ann. & Mag. N. Hist. Ser. 8. Vol. vi. 37 



