222 , FISHES. 



Bright yellow, with a black lateral band formed of con- 

 fluent spots in front; a few brown spots on back; fins 

 plain; D. XV — 15; A. II, 11; size large > Tennessee R. 



2. H. tessellatus, Jordan. Head broad and heavy; 

 mouth large; cheeks and opercles naked; or nearly so; 

 D. X-12; A. II, 8. Allegheny River. 



7. IMOSTOMA, Jordan. Big-headed Darters. 



1. /. shumardii, (Grd.) Jor. Body stout and heavy 

 forward, compressed behind; head blunt, broad and thick, 

 3|^ in length; mouth large, the jaws nearly equal; belly 

 naked anteriorly, scaly behind; cheeks, opercles and 

 neck scaly; breast naked; anal fin large, in males much 

 prolonged, reaching caudal; color dark, vaguely blotched 

 with darker; spinous dorsal with a large black sj^ot be- 

 hind, a smaller one in front; a strong suborbital bar; D. 

 X — 15; A. II, 11; dat. 1. 56. Indiana to Illinois and 

 Arkansas. 



8. RHEOCRYPTA, Jordan. Ripple Darters. 



1. R. copelandi, Jordan. Copeland's Darter. Body 

 rather slender; head rather long and narrow, 4:^ in length; 

 mouth small, subinferior; checks naked; opercles with 

 a few scales; color yellowish, with oblong black spots 

 along the lateral line, smaller than in the species of 

 Alvordlus. D. XI — 10; A. 11,9; lat. 1. 50. Rapids of 

 White River, with lUricosma evides, a small and rather 

 plain, but graceful species. 



9. DIPLESIUM, Rafinesque. Green -Sided Darters. 



^^Hyostoma., Agassiz. 



1. D. blennioides, (Raf.) .Jordan. Greex- Sided 

 Darter. Olive green and tessellated above; sides with 

 a series (jf about seven double transverse bars, each pair 



