3956 Mr. G. A. Boulenger on the 
usually concave, rarely straight or slightly 
CONVERS p5 0its;.2 eps oR CE OER Meee eee bee 1. L. niloticus, Forsk. 
2. Upper lip bordered with conical papille forming a very distinct 
fringe. 
a. Upper edge of dorsal fin straight or more or less convex. 
Dor a with 12-14 branched rays; Sq. 40-44 
a ae aoe ke Ue aco ot ne soos ohoe 2. L. horte, Heck. 
Dorsal with 12-14 branched rays; Sq. 37-40 
a As AG Sane teks Rieti Cette hicks Goat ae 3. L. senegalensis, C.& V. 
Dorsal with 12-13 branched rays; Sq. 36 & gu 
JE h SUM MA Sa ahs Bp MAE eo ch aura NG Shy 4, L. Steindachneri, Pfeff. 
Dorsal with 11 branched rays; Sq. 36-88 
See Nes Cee 5. E. altivelis, Ptrs. 
6. Upper edge of dorsal fin more or a concave. 
Doss with 12 branched rays; Sq. 36 5 
(5a fc Ie eae criras trary oi RES RR RSS Maa Pee ale 6. LZ. Rose, Stdr. 
Deal with 10-12 branched rays; Sq. 38-40 
a His NEI eae Le LSE Ma See 7. I. mesops, Gthr. 
Dorsal with 10-12 branched rays ; Sq. 836-37 
sy Sie eas Sn aba dio la doa Soc pao Soto 8. L. lineatus, Bley. 
B. Inner surface of lips bearing transverse plicee formed by series of 
papillee. 
1. Eyes perfectly lateral, visible from above and from below, or 
nearly perfectly lateral. 
a. Dorsal fin high, with straight or convex (rarely slightly concave) 
upper edge, not nearer aye. than root of caudal, with 12-14 
branched rays; Sq. 36-40 & 6 = 4-5, 16-18. 
No barbel; caudal peduncle nearly twice as 
deepias lomey ey eet oa. serene 9. L. velifer, Ble. 
A small barbel; caudal peduncle much 
deeper than long ; pectoral reaching ven- 
Littetlligs x evs ca ecabeavhe cote eae po tanice ems eciele Cee TC 10. L. longipinnis, Blgr. 
A small barbel ; caudal peduncle not, or but 
slightly, deeper than long; pectoral not 
WER MONE GIN! A adonongoco so 700400 g05 11. ZL. coubie, Rupp. 
b. Dorsal fin nearer eye than root of caudal; Sq. 35-39 7 =f 
4-5, 16. 
Dorsal high, convex, with 11 branched rays ; 
diameter ‘of eye at least 3 times in inter- 
VioiMl wel Sanne paeooqecs4sodoacbss 12. L. congoro, Peters. 
Dorsal with concave upper edge, with 10 or 
11 branched rays ; diameter of eye not 
twice in interorbital width ............ 13. LZ. Gregorit, Gthr. 
Dorsal with concave upper edge, with 10 
branched rays; diameter of eye 2; in 
hanrsword sul MCI Gado CA kaos dou ob ods 14, L. Darling, Bler. 
Dorsal with concave upper edge, with 9 or 10 
branched rays; diameter of eye at least 
3 times in interorbital width............ 15. ZL. victorianus, Bler. 
