88 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. i. 



23. Etheostoma aspro (Cope & Jord.}. BLACK-SIDED DARTER. 

 Percina aspro, Boulenger. 



Nine specimens of this beautiful darter were secured. 



24. Etheostoma microperca (ford. & Gtlb.}. LEAST DARTER. 



A single specimen of this species was taken. It is one of the 

 smallest of fishes. 



