278 



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Wortman, J. L., '93. A new theory of the mechanical evolution of the 

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VARIATION OF NORTH AMERICAN FISHES. II. 



The Variation of Etheostoma Caprodes Rafinesque in Turkey Lake 

 and Tippecanoe Lake.* By W. J. Moenkhaus. 



Introduction. — In a former paper on the "Variation of Etheostoma caprodes 

 Rafinesque" (Am. Nat., Aug., 1894), I determined the geographical distribution 

 of this fish and the geographical variation of its color-pattern and fins. 



It was found that this species inhabits practically all the fresh waters of the 

 Atlantic slope east of the 100th meridian and west of the Alleghany Mountains. 

 Its northern and eastern limits are the Great Lakes and Lake Champlain ; its 

 southwestern, the Rio Grande in the extreme southern part of Texas. 



The following conclusions were reached among others : 



1. Each river system from which specimens were examined possesses a pe- 

 culiar variety. This peculiarity is most striking in the color-pattern. 



2. All the variations are continuous. 



"Contributions from the Zoological Laboratory of thelndiana University under the 

 direction of C. H. Bigenmann, No. 18. 



