NOTE 



A PART of the matter presented in this volume was 



published several years ago by the Wisconsin Biological 



Survey, under the title "Instincts and Habits of the 



Solitary Wasps." These chapters have been revised 



and modified, and new matter based upon later work 



r Nias been added, in the hope that in their present less 



JvXtechnical form the observations recorded will be of in- 



^, terest to the general reader. 



For a number of the text cuts used in this volume we 

 are indebted to the courtesy of Dr. E. A. Birge, Direc- 

 tor of the Wisconsin Geological and Natural History 

 Survey. 



