[Illustration: Page 266 PELOPÆUS ON NEST, GROUP OF FINISHED CELLS, AND TUBE OPENED TO SHOW SPIDERS] 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 interest to the general reader.…
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