14 FIELD MUSEUM or NATURAL HISTORY ZOOLOGY, VOL. XII. 



in the longer snout and eye, shorter barbels, and in the shorter pectoral 

 and more falcate dorsal with lower spine; from luazomelas Lonnberg, 

 in the deeper body, longer head, shorter posterior barbel, higher dorsal 

 spine; from lumiensis in the longer and narrower head, longer snout and 

 eye, shorter posterior barbel, lower dorsal spine, shorter pectoral, and 

 more robust caudal peduncle; from loveridgii in the longer head, smaller 

 eye, in the shorter pectoral, and in the falcate and lower dorsal; from 

 minchini in the smaller eye, longer barbels, lower and more falcate 

 dorsal, shorter pectoral, etc.; from laticeps in the narrower head, smaller 

 eye, lower dorsal, and more robust body; from sexradiatus in the nar- 

 rower interorbital, shorter pectoral, and in the number (7) of branched 

 rays in the dorsal fin; from salmo in the narrower interorbital, lower 

 dorsal spine, and in the position of the pelvic fin base below the origin 

 of the dorsal; from kerstenii in the smaller eye, shorter pectoral, and 

 more falcate dorsal; from entaenia in the same characters and in colora- 

 tion; from neumayeri in the fewer scales along and above the lateral 

 line, in the smaller head and in the more anterior insertion of the pelvic 

 fin in reference to the dorsal; from nairobiensis (from the Athi basin) 

 in the narrower interorbital, shorter barbels, in the insertion of the pelvic 

 fin before the origin of the dorsal, and in the fewer scales (26 to 28, 

 rarely 25 or 29, instead of 28 to 30); from percivali in the smaller eye, 

 narrower interorbital, lower dorsal spine, and in coloration (see note in 

 description of coloration of the young of B. akeleyi} ; from zanzibaricus 

 in the much smaller eye, narrower interorbital, in the larger scales and 

 in the insertion of the pelvic fin; from argentatus in the smaller eye, fewer 

 dorsal rays, in the lower dorsal, fewer scales, etc. 



Depth of body, 3.35 (3.0 to 3.35) in length to base of caudal; length 

 of caudal peduncle from anal base to end of last vertebra, 1.6 (1.5 to 1.8) 

 times its least depth. Extreme length of head, 3.4 (3.2 to 3.5); snout 

 in head, 3.4 (3.4 to 3.8); eye, 5.2 (4.2 to 4.7); least interorbital width, 

 3.2 (2.8 to 3.2); upper jaw extending to about the vertical from the 

 front margin of the orbit, its length 3.4 (3.2 to 3.6) in head; width of 

 terminal mouth, 3.6 (3.2 to 4.0); lips well developed posteriorly, inter- 

 rupted at the chin, anterior barbel as long as eye, ranging to one-third 

 longer; posterior barbel 1.7 (1.5 to 1.8) times eye. 



4/^ 

 Scales radially striate, 26 to 28 (rarely 25 or 29) .^ to ^ 3 between 



lateraVline and ventral, 12 round caudal peduncle. 



