10 CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY II. 



General color a serai-transparent brownish-yellow, a series of rather 

 small horizontally oblong black spots along lateral line, forming an in- 

 terrupted lateral bandj back tesselated, as in. Boleosoma, a blackish 

 streak forward from eye and another downward ; ventral fins dusky ; 

 vertical fins with dusky specks, but scarcely barred ; a black spot on 

 anterior rays of spinous dorsal. 



Length of specimens 2 to 2^ inches. 



Sabitat. — White River, Indiana. The specimens in my possession, 

 some thirty in number, were all taken at the same point, a shallow 

 rapid, where the river flows over line gravel. This locality, the " Eed 

 Bridge-', about five miles north of Indianapolis, is the only one thus far 

 known for this species and for Ericosma evides. It is the best point for 

 the collection of Fleurolepis pellucidus which I know of in the West. 

 As many as thirty specimens of the latter species have been taken there 

 at low water at a single haul of the net. Rheocrypta copelandi and JEri- 

 cosma evides are both extremely local, as a few rods above or below the 

 rapids it is impossible to find either. 



I dedicate this species to the memory of my friend, the late Professor 

 Copeland, to whose patient study of these beautiful little fishes we owe 

 much that is now known of their habits and ways. I have named this 

 graceful species, taken at the rapids where he and I had so often fished 

 together, for him, in recognition of his genuine love of nature, and in 

 token of our long scientific association and personal friendship. 



8. ARLINA ATRIPINNIS, Jordan, sp. nov. 



I admit the genus Arlina provisionally for those species of Boleosoma 

 which have two well-developed anal spines ; but, as I have never seen 

 Arlina effulgens, the type of the genus, I am not certain that that species 

 possesses this character. 



The species of this genus to which the above name has been given 

 may be thus characterized : — 



Body rather short for the genus, somewhat compressed behind ; the 

 depth 4J in length. Head extremely short and deep, 4^ in length of 

 body ; the snout very short and bluntly rounded. Eye quite large, 

 3^ in head. Mouth quite small, with equal jaws, the upper protractile. 

 Cheeks and opercles scaly, the scales on cheeks small and closely set; 

 a triangular series of scales above the opercle behind the eye. Throat 

 smooth; neck above closely scaly; no ventral plates; belly closely 

 scaled. 



