LABEO. , 301 



Synopsis of the S])ecies. 



I. Barbels absent, or one on each side, often very small and hidden under the 



folds at the side of the mouth. 



A. Inner surface of lips not bearing transverse plicse * ; eyes perfectly 



lateral, visible from above and from below ; snout hardly as long as, or 



shorter than, postocular part of head. 



7_9J. 



1. Dorsal with 12-17 branched rays ; Sc. 40-45 pzioi* 



D. Ill 14-17, upper edge usually concave ; 



Sc. 41-45 ^Q,, 5-6, 18-22 "{.... 1. L. nilodcus, Forsk., p. 304. 

 D. Ill 12-14, upper edge straight or convex ; 



Sc. 40-44 T^, 4-5, 16-20 2. L. horie, Heck., p. 306. 



2. Dorsal with 11-15 branched rays, longest ray much longer than head; 



Sc. 36-40 ^;i. 



"2~' 2 



D. Ill 12-15, upper edge straight or convex ; 



Sc. 37-40 -^'% 4, 16 ; depth of body 3^- 



4 times in total length 3. X. senegalensis^ C. & V., p. 308. 



D. IlI-IV 11-13, upper edge convex ; Sc. 

 36-39 ^f=?i, 3i-4i, 16-18 ; depth of body 



"2 '2 



3-3|^ times in total length 4. Z. altivelis, Peters, p. 309. 



D. Ill 12, falciform, upper edge concave ; 

 Sc. 36 Vf, 3|, 16 ; depth of body 3 times 



"-'2 



in total length 5. />. iveeksii, Blgr., p. 310. 



3. Dorsal with 9-12 branched rays, longest ray not much longer than head; 



Sc. 36-41 J^-^f . 



^2~°2 



a. Depth of body 3-3^ times in total length ; caudal peduncle as long as 



deep or deeper than long. 

 D. Ill 9-12, upper edge not or but feebly 



notched ; Sc. 36-37 ^^ 3, 16-18. . . 6. L. linmtus, Blgr., p. 311. 

 D. Ill 11-12, upper edge notched ; Sc. 38- 



39 |, 5, 18 7. L. rosce, Stdr., p. 312. 



b. Depth of body 3^-4^ times in total length ; caudal peduncle 1^ to 1^ 



times as long as deeji. 

 D. Ill 10-12, upper edge notched ; Sc. 38- 



40 pS--, 4-5, 16-18 S. L. meso^is, Gthr., p. 313. 



D. Ill 9-10, upper edge notched ; Sc. 40- 



41 ^% 4-5, 18-22 9. L. ruddi, B1gr., p. 314. 



* These plicse, formed of couflLieDt papiUas, must not be confounded with the ridge of 

 the mouth proper, with which, when present, they run parallel. 



t The figures following those of the transverse series refer to the number of scales 

 between lateral Yme and ventral fin and round caudal peduncle. 



