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. tessef/atus, 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. I. 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 spot be- 

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

 X 15; A. II, 11; 'lat. 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 

 Alvordius. D. XI 10; A, 11,9; lat. 1. 56. Rapids of 

 White River, with Mricosma 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 of about seven double transverse bars, each pair 



