106 MR. G. A. BOULENGBE ON THE AFRlCAJI AND [Feb. 7 



Si/no2}sis of tJie Siudes. 



I. Scales cycloid, without marginal denticulation ; 

 third anal spine not longer than longest dorsal 

 spine. 



A. Gill-rakers 1') to 25 on lower part of anterior 



arch ; 2 or 3 series of scales on the cheek. 

 1. Anal spines 4 ; pectoral not longer than 

 head, not extending to origin of anal ; 

 dorsal XV-XVII 10-12. 

 Teeth in 7 or 8 series ; caudal peduncle a little 

 longer than deep ; maxillary extending to between 

 nostril and eye ; diameter of eye 5 times in length of 

 head; Sq. 355- 1, hunteriOr^. 



Teeth in 4 or 5 series ; caudal peduncle slightly deeper 

 than long; maxillary extending nearly to below 

 anterior border of eye ; diameter of eye 5 to 5 J 



times i n length of head ;Sq.32^ 2. nigra Gthr. 



Teeth in 5 to 7 series ; caudal peduncle not longer 

 than deep ; maxillary extending to between nostril 

 and eye ; diameter of eye 4 to 4J times in length of 



head; Sq. 31-32^ 3. shirana 'Blgv. 



B. Anal spines 3 (exceptionally 4 in T. tnossam- 



hica). 



1. Dorsal XV-XVIII 10-14; pectoral extend- 

 ing to origin of anal or beyond. 



a. Caudal rounded, the membrane between 

 the rays scaleless, except at the base. 

 Pectoral not longer than head ; mouth large, nearly 



as broad as head ; Sq. 30-33 4-7I 4. mossambica 'Pits. 



Pectoral at least as long as head ; mouth ^ to | width 



ofhead; Sq.31-35j^ 5. nilotica h. 



h. Caudal truncate or slightly emarginate ; 

 pectoral at least as long as head. 

 a. Caudal peduncle at least as long as 

 deep. 



Sq. 32-33 jg^^ ; lat. 1. -g^ ; dorsal spines equal in 



length from the sixth 6. tanganicm Gthr. 



Sq. 31-34 r^^ ; lat. 1. p£-^ ; last dorsal spine longest. 7. natalcnsis M. Web. 



|3. Caudal peduncle deeper than long. 

 * Maxillary not extending to below 

 anterior border of eye. 



t Sq. 31-34 rA-. ; mouth not more 



■* 14-10 



than half as broad as head 8. galilaa Hasselq. 



tt Sq. 28-30 ^. 



Depth of body much greater than length of head ; 



last dorsal spine longest , 9. miorocephala'BVsx. 



Depth of body not much greater than length of head ; 



last dorsal spine longest 10. macrocephala'Blgr, 



Depth of body much greater than length of head ; 



dorsal spines nearly equal in length from tlie sixth. 11. nigrijpinnis A. Dum, 



