ALESTES. 191 



A. 25-30 ; gill-rakers 30-38 on lower part 

 o£ anterior arch ; dorsal equidistant 

 from vertical o£ last ray of ventral and 

 first ray of anal, or a little nearer 

 latter 2. A. haremose, Joann., p. 195. 



B. Dorsal originating above ventrals ; scales 39-45 -^.y^ ; gill-rakers 17-20 

 on lower part of anterior arch. 

 A. 20-23 ; depth of body 31-4^ times in 



total length ; interorbital width 3-3^ 



times in length of head 3. ^. macropJithalmiis, Gthr., p. 197. 



A. 18-19 ; depth of body 3^-4 times in 



total length ; interorbital width 2-2| 



times in length of head i. A. liebrechtsii, Blgr., p. 198. 



II. Scales 32-36 |f . 



•>2" 



A. Dorsal originating behind vertical of base of ventrals ; depth of body 



3^-3^ times in total length. 



A. 23 ; a much developed adipose eyelid ; 

 gill-rakers 58 on lower part of ante- 

 rior arch 5. A. stuJdmanni, Pfeff., p. 199. 



A. 19-20 ; adipose eyelid feebly developed ; 

 gill-rakers 17-18 on lower part of an- 

 terior arch &. A. sadleii, Blgr., p. 200. 



B. Dorsal originating above base of ventrals ; depth of body not more than 



3 times in total length. 



A. 26-28 ; head a little longer than deep ; 

 interorbital width not 3 times in length 

 of head T- A. tJwUoni, Pellegr., p. 201. 



A. 22-24 ; liead as long as deep ; inter- 

 orbital width 3 times in length of head. 8. A. intermedius, Blgr., p. 201. 



III. Scales 21-33 ^\ • 



A. Dorsal originating above or immediately behind vertical of base of ventrals. 

 1. 5^ series of scales above lateral line. 



a. Dorsal originating above base of ventrals. 



A. 22-24 ; Sc. 24-29 ; gill-rakers 12-14 on 



lower part of anterior arch . ... 9. A. longipinnis, Gthr., p. 202. 



A. 18-19 ; Se. 30-33 ; gill-rakers 20-27 on 

 lower part of anterior arch ; inter- 

 orbital width 3 times in length of head. 11. A. lateralis, Blgr., p. 204. 



A. 14-18 ; Sc. 26-33 ; gill-rakers 16-20 on 

 lower part of anterior arch; inter- 

 orbital width not 3 times in length of 

 head 12. A. nurse, Kiipp., p. 205. 



