(42) 
General appearance much like that of P. spectabilis , from which it 
differs in the scaly cheeks, the more complete lateral line and the greater 
number of vertical rows of scales. In spectabilis the cheeks are either 
wholly bare, or a few scales appear behind and below the eye. In asprigenis 
they are either wholly covered, or naked only on the lower fourth. 
The vertical rows vary in my specimens of spectabilis from 38 to 43 
(counting only complete rows), — in asprigenis from 48 to 50. In the former, 
the lateral line extends over from 25 to 31 scales — in the latter from 34 to 41. 
The head is small and pointed, the eye large, (longer than snout,) the 
outlines regularly curved, the body compressed and rather deep, the mouth 
terminal, oblique, and the jaws about even. 
The dorsal fins are sometimes separated by distances varying from 
the length of half a scale to a scale and a half, but are occasionally quite 
continuous, the two being united by membrane. 
Length 35 to 45 mm. Depth 44 to 4| in length ; head 3f to 4 ; 
eye in head 3£ to 4 : nose about f the eye. Width at pectorals 8 to 10 in 
length ; at middle of second dorsal, 12 to 15. The caudal peduncle is twice 
long as high. Longitudinal rows |. Breast always naked, opercle wholly as 
scaly, back wholly scaled before the dorsal, or a narrow strip left bare. 
The first dorsal consists of from 9 to 12 spines. Its height is from 
4 to 4 its length, and f the height of the second dorsal. The latter contains 
from 10 to 12 rays, of which, in one case, the first was a stout sharp spine 
(XI — 1, 11). Its length is f that of the first, and greater than that of the 
anal. The anal consists of two spines and 7 or 8 soft rays, the longest ray 
reaching to the middle of the caudal peduncle. 14 specimens examined. 
Taken in small creek near Pekin, 111. 
The naked cheeks and contiguous dorsals are evidently not good gen- 
eric characters of Poecilichthys , S. A. F.] 
Genus ETHEOSTOMA, Rafinesque. 
19. Etheostoma fiabellare Rafinesque. Fan-tailed Darter. (M. V. 227 ; 
Poecilichthys jlabellatus Nelson, 34.) 
In clear waters in the southern part of the state. Specimens 
from Clear Cr., Union Co., and from Wabash River. 
Yar. lineolatum (Agassiz) Jordan. Lined Darter. (M. Y. 227 ; 
Poecilichthys lineolatus Nelson 34.) Clear streams' in northern 
Illinois. Rock River,' Ogle Co. Finish. 
20. * Etheostoma squamiceps Jordan. Scaly-headed Darter. (M. Y. 
228.) 
Known only from western Kentucky. 
Genus BOLEICHTHYS, Girard. 
21. Boleichthys eos Jordan & Copeland. Red Sided Darter. (M. Y. 
228 ; Nelson, 34.) 
In clear cold streams throughout the state. Effingham Co., 
Johnson Co. 
