Ral 
From the foregoing comparison it will be seen that the specimens of Tippe- 
canoe Lake differ in every structure examined from those of Turkey Lake. This 
is true for both species. In some structures this difference is small, as in the anal 
fin, and in others it is greater, as in the scales on the nape and the dorsal rays. 
III. IS THE VARIATION IN THE TWO SPECIES DETERMINATE WITH THE 
LOCALITY? 
But of greater importance is the fact that both species are being modified in 
the same way by the same lake. Thus, with one exception, if a given structure 
varies in a certain manner in Etheostoma caprodes in Tippecanoe Lake, the same 
structure will show a similar modification in Etheostoma nigrum in the same lake. 
This holds true with one exception. 
From tables V and IX, it is seen that both species show a greater per cent. of 
individuals with a scaled nape in Tippecanoe Lake than in Turkey Lake. For 
Tippecanoe Lake the percents of specimens with a naked nape are 19.32, and 50 
for Etheostoma caprodes and Etheostoma nigrum respectively, while for Turkey Lake 
they are 88 and 85 respectively. 
LO MRL AK one whan we Lom Ow ali 18 WS) 2d) 
