10 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY—II. 
General color a semi-transparent brownish-yellow, a series of rather 
small horizontally oblong black spots along lateral line, forming an in- 
terrupted lateral band; 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 24 inches. 
Habitat—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 fine gravel. This locality, the “ Red 
Bridge”, about five miles north of Indianapolis, is the only one thus far 
known for this species and for Hricosma evides. It is the best point for 
the collection of Pleurolepis 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 Hri- 
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 [ had so often fished 
together, for him, in recognition of his genuine love of nature, and in 
token of our long scientifie association and personal friendship. 
8. ARLINA ATRIPINNIS, Jordan, sp. nov. 
if admit the gens 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 44 in length. Head extremely short and deep, 44 in length of . 
body; the snout very short and bluntly rounded. Eye quite large, 
34 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 
sealed. 
