ICHTHELID^E. XCII. 229 



c. Opercle emarginate ; caudal rounded ; spinons and soft 

 dorsals forming an angle; sides with black vertical 



bars MESOGONISTIUS, 8. 



cc. Opercle entire and rounded behind, often more or less 

 produced, and always with a black spot ; caudal emar- 

 ginate. 



d. Maxillary rather broad and flat, somewhat triangular- 

 elongate, with (always?) a narrow supernumerary 

 bone lying along its posterior margin ; mouth w r ide. 



e. Tongue with a conspicuous patch of teeth ; mouth 



very large, maxillary reaching to opposite eye; 

 opercular spot large; body deep, thick and strong, 

 with large scales; aspect and dentition of Amblo- 



plites GLOSSOPLITES, 9, 



ee. Tongue without teeth ; mouth smaller ; maxillary not 

 reaching to middle of eye ; opercular spot small ; 

 body elongated; scales small, usually with blue 

 clots ; aspect and dentition of Ichthelis. 



CH^NOBRYTTUS, 10. 



dd. Maxillary narrow and thicker, approaching club- 

 shaped, without supernumerary bone ; mouth usually 

 smaller; colors mostly bright. 



f. Lower pharyngeal teeth conic, acute; opercular flap 



various, usually more or less elongated in adult. 



ICHTHELIS, 11. 



ff. Lower pharyngeal teeth rounded, pavement-like; 

 opercular flap rather short and broad, distinctly 

 tipped below and behind with scarlet. 



POMOTIS, 12. 



1. MICROPTERUS, Lacepede. BLACK BASS. 



> Huro and G-rystes, C. & V. 



= Calliurus, Raf. (not of Agassiz.) 



= Lepomis, Raf. 



1. M. nigricans, (Cuv.) Gill. LARGE-MOUTHED BLACK 

 BASS. OSWEGO BASS. Dull olive green, more or less 

 spotted when young but not barred; usually with an 



