DESCRIPTION OF A NEW SPECIES OF DARTER FROM TIPPECANOE FAKE. 
By WILLIAM J. MOENKHAUS, 
Assistant Professor of Zoology , Indiana University . 
During the summer of 1896, while collecting large quantities of Perdna caprodes 
in Tippecanoe Lake, a single large specimen of darter was taken which could not be 
identified with any described species. 1 thought then and since, until recently, that it 
might be a hybrid between Perdna caprodes and Hadropterus aspro, because of 
evident intermediate characters. After holding the specimen for six years with the 
hope that other specimens might be taken, I published a note in the Proceedings of 
the Indiana Academy for 1902 (pp. 115-116), under the title “An aberrant Etheos- 
toma,” in which I briefly described the specimen and compared it with Perdna 
caprodes and Hadropterus aspro. Last summer the sandbar on the south side of the 
east end of the lake was again extensively seined, and among some 500 or 600 Perdna 
caprodes 2 small specimens — probably that summer’s brood — were taken which, beyond 
a doubt, are similar to the specimen taken six years previously in a part of the lake 
3 or 1 miles distant. Among a peck of darters from a part of Tippecanoe Lake that 
the labels do not indicate, collected in 1898 by some students of the Indiana Univer- 
sity Biological Station, I found 3 similar specimens, making 6 specimens of this type 
from different parts of the lake. There can no longer be any doubt that we have to 
do with a distinct species, and, so far as I can determine, the species is undescribed. 
This new species is among the most beautiful and largest of the darters. It gives 
me the greatest pleasure to name the species for Dr. Barton Warren Evermann, 
ichthyologist of the U. S. Fish Commission. 
Hadropterus evermanni Moenkhaus, new species. 
Head 4 in length; depth 6.16; eye 3.8 in head; snout 3.95; D. xvi, 14; A. it, 11; scales 8-79-9. 
Form of body much like that of II. aspro, rather elongate, fusiform, somewhat compressed pos- 
teriorly, hut less pointed anteriorly; mouth moderately large, maxillary reaching pupil; cleft of 
mouth almost horizontal, lower jaw included; eye large, about equaling snout; interorbital rather 
broad, flat; gill-membranes free from isthmus and separate; opercular spine and flap well developed; 
preopercle entire. Scales ctenoid; nape with fewer, smaller, embedded scales; median ventral line 
in one specimen provided with a row of closely set, slightly enlarged scales; a second specimen has 
3 or 4 such scales, remaining specimens without scales; breast naked; opercle with closely set ctenoid 
scales slightly smaller than tnose on body; cheeks with fewer, still smaller, embedded ctenoid scales; 
lateral line complete, slightly arched over pectorals. Pectoral and ventral fins about equal in length, 
measuring 1.4 in head; origin of spinous dorsal one-third distance between snout and base of caudal; 
origins of soft dorsal and anal equally distant from snout, the distance from snout 1.56 in body length; 
spinous dorsal somewhat longer than soft dorsal, the latter longer than anal; these 3 fins about the same 
height, the order of their height in an ascending series being spinous dorsal, soft dorsal, anal; their 
heights being, respectively, about 2.5, 2.2, and 2.1 in head. 
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