ETHEOSTOMLD^E. LXXXIX. 221 



3. B. exit is f Girard. SLENDER RED- SIDED DARTER. 

 Lateral line on 22 to 28 scales, about reaching end of first 

 dorsal; head 3f in length; caudal peduncle much 

 elongated ; olivaceous brown, with zigzag markings, sides 

 with about ten red spots, separated by brown interspaces; 

 first dorsal bluish at base, red above; other fins reddish 

 and barred; oblique streaks downward and forward from 

 eye; D. IX or X 9 to 10; A. II, 7; lat. 1. 60; length 2 

 inches. Wisconsin to Idaho; abundant in clear brooks. 



6. PLEUROLEP1S, Agassiz. PELLUCID DARTERS. 

 1. P. pellucidus, Agassiz. SAND DARTER. Depth 6 

 to 8 in length; body nearly cylindrical; head elongated, 

 pointed; scales small, finely dotted, far apart, and deeply 

 imbedded; fins small; color pinkish white, pellucid in 

 life, with a series of small, squarish, olive (blue) blotches 

 along back, and another along sides, the spots connected 

 by a gilt line; D. X 9; A. II, 6; length 2 to 3 inches. 

 Ohio Valley, in sandy streams; one of the most interest 

 ing of our fishes. 



7. BOLEOSOMA, DeKay. TESSELLATED DARTERS 



&amp;gt; Arlina and E&trella, Grd. 



* Dorsal, with 9 spines ; soft dorsal much larger than anal. 

 (Boleosoma.) 



1. B. olmstedi, (Storer) Ag. TESSELLATED DARTER. 

 Fins stouter and higher than in the next; depth 5^ in 

 length; head 4^; olivaceous, fins barred; back tessel 

 lated; a black streak forward, and another downward 

 from eye; cheeks and opercles scaly; neck and throat 

 bare; D. IX 14; A. I, 8; lat. 1. 50.&quot; New England to 

 Wisconsin; abundant eastward. Western specimens 

 generally have D. IX, 12, and perhaps vary into the 

 next. (_Z&amp;gt;. tessellatum, DeK.) 



