CENTRAECniD^. 43 



lines ; opercular flap pretty loDg, rather narrow, its lower margin being 

 shorter than the upper, directed more obliquely upward than in the 

 other species, bordered above and below with pinkish, many of the 

 scales of the back and sides marked with a short horizontal black line 

 liiie a pencil-mark, these usually forming interrupted lines along the 

 rows of scales. These markings are often obsolete. Fins dark olive, 

 only the anal usually with red ; no black dorsal spot. 



Length of specimens examined about 4 to 5 inches. 



Habitat. — Tennessee River ( Agassiz, Cope) ; Etowah Kiver (Jordan) ; 

 White River, Indiana (Jordan) ; Mississippi Eiver at Cairo (Jordan). 



This species may be known to be a Xenotis by the ear-flap and the 

 weak gill-rakers. From the other Ohio species, its longer spines, dark 

 green coloration, and the peculiar upward direction of the opercular 

 flap distinguish it. The black streaks which suggested the name in- 

 scriptus usually disappear with death. 



27. LEPIOPOMUS PALLIDUS, (MitcUll) Gill & Jordan. 



Labi-us pallidus, Mitchill, 1814, = Labrus appendix, Mitchill, 1818, = Pomolls inoisw, 

 Cuv. & Val., 1831. 



We have here restored the oldest and therefore correct specific name 

 to this species. The genus Helioperca, recently proposed by me for 

 •this species and its immediate relatives, does not seem sufQciently dis- 

 tinct from Lepiopomiis. I therefore abandon it, for the present, at least. 



28. MICROPTERDS PALLIDUS, iRafi.iesque) Gill & Jordan. 



Lepomia pallida, Eafinesque, 1820, = Cichla floridana, Le Sueur, 1822, = Huro nigri- 

 cans, C. & v., 1828. 



Rafinesque's description of his Lepomis pallida seems to have been 

 drawn from this species. His specific name should therefore be adopted. 

 This change is especially desirable, as it does away with the objection- 

 able local name floridanus for this widely distributed species. 



29. STIZOSTETHIDM, Eafinesque. 



The American species of this genus have been involved in consider- 

 able confusion, and no one seems to know positively whether we have 



