192 CHAEACIKID^. 



b. Dorsal behind vertical of base of ventrals. 

 A. 21-23 ; Sc. 25-28 ; gill-rakers 12-13 on 



lower part of anterior arch ; eye as 



long as postocTilar part of head . . .10. A. cJiaperi, Sauv., p. 203. 

 A. 19-21 ; Sc. 25-27 ; gill-rakers 18-20 on 



lower part of anterior arch ; eye 



shorter than postocular part of head . 13. A. affinis, Gthr., p. 208. 



2. 4| series of scales above lateral line. 



a. Interorbital width at least twice in length of head ; A. 15-20. 



a. Dorsal originating above middle or last rays of ventrals ; gill-rakers 

 16-20 on lower part of anterior arch. 

 A. 17-19 ; Sc. 23-29 ; interorbital width 



2^-2§ times in length of head . . .14. A. imheri, Peters, p. 209. 

 A. 17 ; Sc. 30 ; interorbital width nearly 



3 times in length of head 15. A. liumilis, Blgr., p. 211. 



A. 15-16 ; Sc. 24-25 ; interorbital width 



2J to 2^ times in length of head. . . 16. A. kingsleyce, Gthr., p. 212. 



/S. Dorsal entirely behind vertical of base of ventrals ; gill-rakers 20-26 

 on lower part of anterior arch. 

 A. 15-17 ; Sc. 27-29 ; interorbital width 



2—2^ times in length of head . . . 17. A. biinaculatus, Blgr., p. 213. 

 A. 18-20 ; Sc. 23-26 ; interorbital width 



2-2^ times in length of head . . .18. A. tceniurus, Gthr., p. 214. 

 A. 16-18 ; Sc. 24-27 ; interorbital width 



2|-3 times in length of head . . . 19. A. opistliotcenia, Blgr., p. 215. 

 h. Interorbital width once and § in length of head. 

 A. 13 ; Sc. 22 20. A. poptce, Pellegr., p. 216. 



B. Dorsal fin well behind vertical of base of ventrals, originating much nearer 

 caudal than end of snout; 4^ series of scales above lateral line. 



1. Distance between end of snout and occiput much greater than width of 



head ; depth of body 3^4^- times in total length ; A. 15-17. 



Sc. 22-26 2\.. A. macrolepidotus, Cuv., p. 217. 



Sc. 28-29 22. A. rhodopleura, Blgr., p. 218. 



2. Distance between end of snout and occiput not or but little greater than 



width of head in the adult. 

 A. 13-14 ; Sc. 23-27 ; depth of body 3^-4 



times in total length 23. A. grandlsquamis, Blgr., p. 220. 



A. 15-16 ; Sc. 28-29 ; depth of body 3J-4 



times in total length 24. JL. batesii, Blgr., p. 221. 



A. 16-18 ; Sc. 21-23 ; depth of body 2|-3 



times in total length 2i). A. brevis, Blgr., p. 222. 



