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 

 has been added, in the hope that in their present less 

 technical 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. 



