STNODONTIS. 393 



Ventral reaching anal, both rounded ; humeral 



process not much longer than deep ; skin 



smooth 10. S. caudovittatus, Blgr., p. 412. 



Ventral not reaching anal, both rounded ; 



humeral process narrow, much longer than 



deep; skin granular 11. S. granulosus, Blgr., p. 413. 



XX Movable mandibular teeth 20 to 40 ; base o£ adipose doraal 

 1£ to 2^ times its distance from rayed dorsal ; humeral 

 process longer than broad. 

 Pectoral spine feebly serrated on outer border, 



not reaching ventral ; mandibular barbels 



with long slender branches ; skin smooth. 12. S. zambesensis, Peters, p. 415. 

 Pectoral spine strongly serrated on both sides, 



nearly reaching ventral ; mandibular 



barbels with long slender branches ; skin [p. 416. 



smooth 13. S. nigromaculatus, Blgr., 



Pectoral spine strongly serrated on both sides, 



nearly reaching ventral ; mandibular 



barbels with long slender branches ; skin 



villose on sides 14. S. melanostietus, Blgr., p. 418. 



Pectoral spine strongly serrated on both sides, 



not reaching ventral ; mandibular barbels 



with short, mostly bifid branches ; skin [p. 419. 



smooth 15. S. multimaculatus, Blgr., 



XXX Movable mandibular teeth 14 to 21 (usually less than 20). 

 Pectoral spine very feebly serrated or nearly 



smooth on outer side ; adipose dorsal 2 to 



3 times as long as its distance from rayed 



dorsal ; spine of dorsal a little shorter than [p. 420. 



head ; head little longer than broad . . 16. 8. multipundatus, Blgr., 

 Pectoral spine feebly serrated on outer side; 



adipose dorsal If to 2 times as long as its 



distance from rayed dorsal ; spine of dorsal 



a little shorter than head ; head 1^ times 



as long as broad 17. S. victoria;, Blgr., p. 421. 



Pectoral spine feebly serrated on outer side ; 



adipose dorsal as long as its distance from 



rayed dorsal ; spine of dorsal much shorter 



than head ; anal pointed in front . . .18. S. nebulosiis, Peters, p. 423. 

 Pectoral spine feebly serrated on outer side ; 



adipose dorsal as long as its distance from 



rayed dorsal ; spine of dorsal a little 



shorter than head ; anal rounded . . .19. S. icoosnami, Blgr., p. 424. 



