64 Ml-. C. T. Rogan on the Fishes of the 



I). XVIII-XIX 9-10. A. VIII-X 7-8. Snout 



not shorter than postorbital part of head. ... 9. spilurum. 



D. XViri-XIX 7-S. A. XI-XII 7-8 10. spinosksimum. 



D. XVIII-XIX 9-10, A. IX 9 11. immaculatum. 



4. D. XVI 8-9. A. X-XI 8-9. 15 gill-rakers on the lower part 



of the anterior arch 12. centrurchus. 



5. D. XV-XVin 10-15. A. IV- VII 8-11. Scales of thoracic 



region considerably smaller than those on the side of the 

 body. Either less than 11 gill-rakers on the lower part of 

 anterior arch or the depth of body ^ or less than ^ its length. 

 Pectoral not extending to above the anal. Soft dorsal more 

 or less distinctly scaly at the ba-^e. 

 o. Caudal truncate or rounded. 



a. Last dorsal spine ^-f the length of head; lower jaw 

 shorter than the upper ; depth of body 2i-2| in the 

 length. D. XVn-XVIII 12-15. A. V-VI 8-10. 

 Length of head 3|-3| in the length of the fish . . 13. Eic/enmanni. 

 Length of head 3^-4 in the length of the fish . . 14. nebuliferum. 



13. Last dorsal spine f-| the length of head ; jaws equal 

 anteriorly, 

 t Depth of body l§-2 in the length ; caudal peduncle ^-| 

 as long as deep. 

 D. XVI-XVII 12-14. A. VI-VII 9-10. Last 

 dorsal spine more tlian I the length of head. 

 A large dark blotch on the caudal pflduncle. . 15. mdcidicauda. 

 D. XVIl-XVIII 11-13. A. VI-VII 8-9. Last 

 dorsal spine \ the length of head. Dark 

 cross-bars and a dark band from operculum 

 to base of caudal 16. fenestratum. 



ft Depth of body 2 in the length ; caudal peduncle as long 

 as deep ; last dorsal spine | the length of head. 



D. XVII 13. A. VI 9 17. bifasciatum. 



ttt Depth of body 2-l-2f in the length ; caudal peduncle 

 from f to as long as deep ; last dorsal spine |-^ the 

 length of head. 

 * 8 to 10 gill-rakers on the lower part of the anterior 



arch ; anal with 6 or 7 spines. 18. guttidntum. 

 ** 7 or 8 gill-rakers on the lower part of the anterior 

 arch ; anal with 4 to 6 spines. 

 X Fold of the lower lip continuous. 



19. mkrophthdhnus. 

 \X Fold of the lower lip not continuous or sub- 

 continuous. 



§ Caudal peduncle § as long as deep, 



20. sexfasciatuvi. 

 § § Caudal peduncle from | to as long as deep. 



3 scales between lateral line and base of anterior 



part of soft dorsal; interorbital v. idth 2^-3 



in the length of head ; 2 dark longitudinal 



bands or series of spots, one above the upper 



lateral line, the other from the middle of side 



to the base of caudal 21/ melanurum. 



3 scales between lateral line and base of anterior > 



part of soft dorsal ; interorbital width 2|^-2| *■ 



\ 



