215 ' 
Table III contains the counts for 500 specimens of Etheostoma nigrum from 
Tippecanoe Lake. The females of this group of individuals are more variable 
than the males in all structures. This differenge in variability is most pronounced 
in the anal fin. In the males 66.40 per cent. of the specimens have the prevailing 
number of rays, 9, as compared to 56.80 per cent. in the females. This leaves 
33.60 per cent. of the specimens varying from this number in the males compared 
to 43.20 per cent. in the females. This difference is less pronounced in the other 
two fins, but from its constancy in all three of the fins it certainly must be taken 
as a sexual difference. 
The average variability of each individual from the mean of the group is 
given under each column. Averaging these averages we have the average devia- 
tion of the male to the female as .40266: .4540. 
\ 
Il. HOW DO THE SPECIMENS IN TIPPECANOE LAKE DIFFER FROM THOSE IN 
TURKEY LAKE? 
In a previous article* I described a number of local varieties of color pat- 
terns that were found in this species. Later I gave a more detailed comparison 
of this species as it occurs in Turkey Lake and Tippecanoe Lake. The num- 
ber of specimens involved were 600 from Turkey Lake and 500 from Tip Pecanle 
Lake. Comparisons were made upon the dorsal and anal fins, the scale 
in the lateral line and on the nape and upon the color pattern. The following 
facts were observed: 
1. Coloration.—The color-pattern of Turkey Lake specimens is, on the whole, 
of a more blotched character than that of Tippecanoe Lake specimens, and shows 
a slighter affinity to the simple, primitive coloration characteristic of the Wabash 
River forms. 
2. Lateral Iine.—The specimens of Turkey Lake have on an average two 
more scales in the lateral line. The average number for Turkey Lake is 89.46 for 
the left side, 89.74 for the right side; for Tippecanoe Lake, 87.69 for the left side, 
87.45 for the right side. 
3. Squamation of Nape.—In Turkey Lake the nape is usually naked; in Tip- 
pecanoe Lake the nape is usually scaled. (See Table V.) 
4, Do sal and Anal Fin.—Decided differences are found in the dorsal fins. 
The data have been incorporated in the tables below, and these differences will be 
given then. The anal fin is slightly larger in the Tippecanoe Lake specimens. 
*The variation of Etheostoma caprodes Rafinesque in Turkey Lake and Tippecanoe Lake 
Proc. Ind. Acad. Sei. No. V, 1895, pp. 278-296. 
