1894.] - Variation of North American Fishes. 645 
the original bars, however, can be traced. The lateral spots, 
too, are much more prominent than in the preceding pattern. 
In the older individuals the bars have become so much split 
up as to form a complicated network, and the original pattern 
can be made out only in a general way. The spots are larger 
and darker than in the younger, and form almost a continuous 
lateral band. The radiating bars around the eyes are corre- 
spondingly more developed, the one extending backward in 
a slight curve beyond the head to the first lateral spot. 
In the last pattern, the original simple whole and half bars 
have reached their greatest modification, and the faint lateral 
spots of fig. 2 have become the most prominent part of the 
coloration. 
The variation presents a piil modification in two divergent 
lines from an original simplest pattern. Beginning with the 
whole bars of fig. 1, we pass to the form having alternate whole | 
and half bars,and an imperfect series of lateral spots. From 
this form we pass on the one hand to the pattern having alter- 
nate whole, half and quarter bars, and -on the other hand to 
the pattern consisting of reticulated markings above, and a 
very prominent series of spots along the sides. In the pattern 
of fig. 6, we have a second divergent line of development from 
fig.5. The radiating bars around the eyes become more devel- - 
oped as we pass from the simple to the more complex patterns, 
with the exception in fig. 6. 
It will be seen from the localities at which each of the vari- 
ous patterns occurred, that there is no definite serial relation 
between the variations and the latitude at which they are 
found. As already stated, however, the variations are remark- 
ably definite fora given locality. T dA RR from the Wa- 
bash waters can,almost without exceptio d from 
those of the Cumberland River, for. instance, while those from 
the Alabama River are distinguished by their invariably 
broader bars. Both the patterns of figs. 4 and 6 occur in the 
Cumberland and Tennessee River system, but both have not 
been taken from the same tributaries of these streams. 
The color pattern of Etheostoma caprodes is of interest when f 
considered as to its bilateral symmetry. In most of the sim- — 
