658 The American Naturalist. — [August, 
sota); Jordan, Geo. Surv. of Ohio, IV, 1878, 971. (Lakes of 
N. Ind., Mich. and Wis.) 
Percina caprodes manitou Jordar? & Gilbert, Syn. Fish. N. 
Am., 500, 1888. (Potomac R., Ills., Wis.) ; Jordan, Man.Vert., 
1890, 126. (E. and N. U. S.) 
To illustrate the distribution, the localities contained in the 
works quoted in the bibliography have been marked in the 
aceompanying map. 
The localities from which I examined specimens have 
been marked 4. The areas inhabited by the various color 
patterns, as determined by my specimens, and by reports 
containing sufficiently minute descriptions, are indicated on 
the map by broken lines. The patterns distributed in each 
area is indicated by the number of the figure in the plates 
representing the pattern. In some cases it could not be deter- 
mined which pattern occurred at the locality. There are some 
localities on the map, therefore, that are not included in any 
of the marked areas. 
In conclusion, it may be observed: 
1. The variation between specimens of the same locality is 
very slight. 
2. The most complicated color pattern can be connected 
with the simplest by a series of intermediate stages. 
3. The variation in color pattern cannot be connected with 
the latitude inhabited by the different varieties. The color 
variation is determined, but not in a direct line north and 
south. | 
4. The simplest color pattern of the body, found only in im- 
mature specimens, consists of nine transverse bars. , 
5. The simplest color pattern of adults consists of the nine 
bars seen in the young plus half bars between each two of the 
primary bars. 
6. The next complieation arises by the addition of quarter 
bars. These bars are first introduced in the region between 
the two dorsals, from which region variation seems to radiate. 
7. Another complication may be the splitting of the bars 
into reticulations on the back and Rr intensification into 
BC larger spots along the sides. 
