33° Field Museum of Natural History — Zoology, Vol. VII. 



life these bars in males, dark indigo-blue, the inter-spaces blood- 

 orange ; spinous dorsal crossed at its middle by a row of orange spots 

 or an orange band, above and below this, pale to deep indigo-blue 

 bands, at base of fin a narrower band of orange with orange red spots; 

 female duller in color. 



Length 2 inches. 



This fish is a resident of the Ohio and Upper Mississippi Valleys. 



Des Plaines River, Berwyn, Illinois; Hickory Creek, Marley, 

 Illinois; Hickory Creek, New Lenox, Illinois. 



Etheostoma flabellare Rafinesque. Fan-tailed Darter. 



Head 3.6 to 4.2; depth 4.6 to 4.8; D. vii or viii — 12 to 14; A. 11, 

 7 or 8; scales 51 to 63. 



Body robust, compressed; head long, slender, somewhat depressed 

 with slight angle at nape; interorbital space flat; mouth rather 

 large, terminal, oblique, the lower jaw the longer; cleft of mouth 

 2.9 to 7,.^ in head; margin of upper lip on level with upper third of 

 pupil ; maxillary reaching past front of orbit ; gill membranes broadly 

 connected; spinous and soft dorsals slightly joined at base; separa- 

 tion of ventrals about half their width at base; cheeks and opercles 

 usually naked; nape naked or with deeply embedded scales; breast 

 naked; belly covered with ordinary scales; lateral line incomplete, 

 absent on 15 to 25 scales. 



Color rather dark, with small dark spots and faint crossbars; each 

 scale with a dark spot, forming lines along the rows of scales; a dark 

 streak across opercles, and through eye to end of snout; males with 

 10 to 12 crossbars, these faint in the females; soft dorsal, caudal, and 

 anal fins finely barred; spinous dorsal reddish, the spines in breeding 

 males with fleshy knobs. 



Length 2 to 2X inches. 



This fish ranges from Iowa to New York and South Carolina. 



Des Plaines River, Berwyn, Illinois; Hickory Creek, Marley, 

 Illinois; Hickory Creek, New Lenox, Illinois. 



Genus Boleichtliys Girard. 



Body elongate, little compressed; mouth small, its gape nearly 

 horizontal; premaxillaries not protractile; ventral surface with 

 ordinary scales; gill membranes scarcely connected; lateral line 

 incomplete, slightly curved upward anteriorly. 



