LABEO. 301 



Synopsis of the Species. 



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. 



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

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



Sc. 41-45 Jf(|, 5-6, 18-22 t • • . . 1. i. niloticus, Forsk., p. 304. 

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



Sc. 40-44 g, 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 35^. 

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



Sc. 37-40 ^^^, 4, 16 ; depth of body 31- 



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



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



36-39 |;^, 31-41 16-18 ; depth of body 



3-3i times in total length 4. i. altivelis, Peters, p. 309. 



D. Ill 12, falciform, upper edge concave ; 



5- 

 Sc. 36 gf, 3^, 16 ; depth of body 3 times 



in total length 5. L. weeksii, Blgr., p. 310. 



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



Sc. 36-41 Jp|. 



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 giZaL 3, 16-18. . . 6. L. lineatus, Blgr., p. 311. 

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



39 ^, 5, 18 1. L. rosce, Stdr., p. 312. 



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



times as long as deep. 

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



40 ^fj-, 4-5, 16-18 8. L. mesops, Gthr., p. 313. 



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



41 ^^ 4_5^ 18-22 9. L. ruddi, Blgr., p. 314. 



* These plicae, formed of couflueDt papiHa, 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 line and ventral fin and round caudal peduncle. 



