347. Profile very convex; with twelve to fourteen spines in the first dorsal 



fin; N. Y. to Kansas 



Etheostoma hlennioides Raf. Green-sided Darter 

 Profile not so convex; usually with less than twelve spines in the first 

 dorsal fin 348. 



348. Operculum scarcely scaled; dorsal fin barred; Ind. to Arkansas 



Ulocentra histrio (J. & G.) 

 Operculum scaled; dorsal fin spotted; Kentucky southwards 

 Ulocentra simotera (Cope) 



349. Gill membranes broadly connected across the isthmus; Tennessee Valley 



Swainia squamata (G. £«? S.) 

 Gill membranes scarcely connected 350. 



350. Operculum and breast bare; males with red coloring; O^ark region 



Hypohomus nianguae (G. d? M.) Niangua Darter 

 Poecilichthys nianguae (G. £s?M.) 

 Operculum and breast with small scales 351. 



351. With a row of dark blotches joined along each side; dorsal spines fifteen; 



Tennessee Valley 



Hypohomus aurantiacus (Cope) 

 With two light streaks with darker color between along each side; dorsal 

 spines twelve to fourteen; Missouri 



Hypohomus cymatotaenia (G. ^ M.) 



352. Gill membranes broadly joined across the isthmus; pelvic fins well 



separated 353. 



Gill membranes scarcely or not joined; pelvic fins close together 354. 



353. Anal fin about as large as the soft dorsal fin; Ohio Valley 



Poecihchthys variatus (Kirtland) 

 Anal fin much smaller than the soft dorsal; central states (Several 

 species, of which the most widely distributed is given) 

 l\lanostoma zonale (Cope) Banded Darter 

 Poecilichthys zonalis Cope 



354. No scales on the operculum; brilliantly colored fishes with the fins dark 



edged; Illinois to Penna. and N. Carolina 



J^lothonotus camurus (Cope) Blue-breasted Darter 

 Poecilichthys camurus Cope 

 With scales on the operculum 355. 



355. With dark cross bands; shoulder with a large dark scale; Alabama 



T^othonotus jordani (Gilbert) Jordan's Darter 

 (Poecilichthys jordani (Gilbert) ) 

 Coloration spotted or striped; no large dark scale on the shoulder 356. 



356. Usually with more than 55 scales in the lateral line; fins not red bordered; 



Ala. to Ohio and Indiana 



Tslothonotus maculatus Kirtland 

 (Poecilichthys maculatus Kirtland) 

 Usually with less than 50 scales in the lateral line; fins red bordered; 

 Cumberland, Tennessee and Green Rivers 



300 



