DISTICHODUS. 259 



Sc. 68-75 jq2i2, 7-8 between lateral line and 



ventral 6. D. maculatus, Blgr., p. 2Qi. 



h. D. 22-27 ; A. 13-16. 



a. Interorbital width 1^ to 1| times length of snout in adult. 

 Sc. 68-75 jq, 13-14 between lateral line and 



ventral; caudal peduncle much deeper 



than long 7.1). petersii, Pfeff., p. 2G5. 



Sc. 60-66 ' „ , 9-10 between lateral line and 



ventral ; caudal peduncle much deeper 



than long 8. Z>. antonii, Schilth., p. 266. 



Sc. 68-77 j-^, 10 between lateral line and 



ventral ; caudal peduncle as long as deep . 9. D. atroventralis, Blgr., p. 267. 

 /S. Interorbital width equal to or slightly greater than length of snout. 

 Sc. 67-70 ~. , 11-12 between lateral line and 



lb 



ventral ; base of dorsal twice as long as 



its distance from adipose fin ; maxillary 



not extending to below nostrils .... 10. D. mossamhicus, Peters, p. 268. 



Sc. 66-78 ■ -".,,. , 10-11 between lateral line and 

 14-16 



ventral ; base of dorsal not twice as long 

 as its distance from adipose fin ; maxillary 



extending to below nostrils 11. -D. /a*«"ote)w, Blgr., p. 270. 



Sc. 75-85 ^1=1^, 11-12 between lateral line and 

 ventral ; base of dorsal not twice as long 

 as its distance from adipose fin ; maxillary 

 extending to below nostrils 12. D. engyceplialiis, Gthr., p. 271. 



2. Scales 80-110 ~ , , 13-20 between lateral line and root of ventral ; 

 A. 13-15 ; interorbital width much greater than length of snout. 

 D. 20-23 ; Sc. 80-91 1^, 18-20 between 



lateral line and ventral 13. i?. hrevipinnis, Gthr., p. 272 



D. 22-26 ; Sc. 90-110 |?=g, 15-18 between 



lateral line and ventral 14. D. niloticus, L., p. 273. 



D, 22-24; Sc. 83-98 }^^20' ^^~^^ between 



lateral line and ventral 15. Z*. rostratus, Gthr., p. 275. 



B. Snout deeper than long^ strongly compressed. 

 D. 24-25 ; A. 12-14 ; Sc. 60-68 ^, 11 



between lateral line and ventral . . . . 16. D. sexfasciatus, Blgr., ji. 276. 



G. Snout longer than deep, not compressed. 

 D. 24-26 ; A. 13-14 ; Sc. 70-85 i|^J 11-13 



between lateral line and ventral . . . . 17. Z>. lusosso, Schilth., p. 277. 



S 2 



