In this volume I have collected all the essays on Wild Bees scattered through the "Souvenirs entomologiques," with the exception of those on the Chalicodomae, or Mason-bees proper, which form the contents of a separate volume entitled "The Mason-bees." The first two essays on the Halicti (Chapters 12 and 13) have already appeared in an abbreviated form in "The Life and Love of the Insect," translated by myself and published by Messrs. A. & C. Black (in America by the Macmillan Co.) in 1911. With the greatest courtesy and kindness, Messrs. Black have given me their permission to include these two chapters in the present volume; they did so without fee or consideration of any kind, merely on …
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