14 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY II, 



mm. Spinous dorsal low and small, the spines subequal, scarcely half the height 

 of the soft rays, in males ending in little fleshy knobs; mouth rather 

 large, the lower jaw the longest ; body elongated, compressed ; lateral 

 line extending less than half the length of the body ; head naked (except 

 in the aberrant E. sqaamiceps, which is an exception to all these char- 

 acters, save those drawn from the dorsal tin) Etheostoma, 15. 



II. Dorsal fins about equal, well separated ; body elongated ; cheeks and opercles 

 scaly : 

 «. Lower jaw longest ; lateral line unknown (genus admitted provisionally, the 

 type-species apparently has not been seen since its original description) : 



Alvarius. 16. 

 nn. Jaws about equal ; lateral line curved upward over the pectorals, not 



reaching to middle of body; body elongated Boleichthys, 17. 



kk. No lateral line ; dorsal fins small, subequal, well separated ; mouth small, with 

 ■ nearly equal jaws ; scales large ; size smallest of all spiny-rayed fishes, 



MiCKOPERCA, 18. 



CATALOGUE OF SPECIES OF ETHEOSTOMATID^. 



The following catalogue includes those species of Etheostomatidte 

 which appear to be valid, with the geographical distribution of each so 

 far as recorded. Species unknown to me are indicated by a star (*). 

 In arrangfng the genera, I begin with the type most generalized, or 

 most like ordinary Percidw, Eadropterus. The relations of the aber- 

 rant genera Pletirolepis and Ammocrypta are probably most with Al- 

 ■vordius, a fact which cannot well be shown in a linear series. I omit 

 several species, which very likely may prove valid, but of whose rela- 

 tions I can form no definite opinion from the published accounts. lu 

 each geuus, the type-species is placed first. 



Hadropterus, Agassiz. 



1. Hadroptepus nigrofasciatus, Ag. — South Carolina to Tennessee and 



Louisiana. 



2. Hadropterus tessellatus, Jordan. — Vermont (?) to Pennsylvania. 



3. Hadropterus aurantiacus, (Cope) Jor.* — ^Virginia to Tennessee. 



Ericosma, Jordan. 



4. Ericosma evides, Jordan & Copeland. — Wabash Valley. 



Alvordius, Girard. 



5. Alvordius maculatus, (Grd.). — Pennsylvania to North Carolina. 



6. Alvordius aspro, Cope & Jordan. — Upper Mississippi Valley and 



Upper Lake Region. 



7. Alvordius nevisensis. Cope.* — North Carolina. 



