43° The Ohio Naturalist. [Vol. IX, No. 3, 



the results obtained. Professor J. S. Hine gave the use of his 

 private collectionjand also offered many valuable suggestions. 

 Miss M. M. Haskins, of Toledo, Ohio, continued the observations 

 atjthe Lake Laboratory for some time after August 1st when the 

 writer left. Thanks are also due Mr. R. J. Sim for the observa- 

 tions made upon Disonycha pensylvanica pallipes, which he 

 kindly furnished, and which are included in the present treatise. 



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