The Mason-Wasps

For reasons which will be easily apparent to the reader, I have reprinted the chapter called Instinct and Discernment, which was included in Bramble-bees and Others, and that on the Volucella, which, under the title of The Bumble-bee Fly, formed part of The Life of the Fly. Apart from the two chapters named and the essay on the Eumenes, which figures in The Wonders of Instinct, published in America by the Century Co., none of the contents of this volume has until now appeared in the English language. The Volucella is included by arrangement with Mr. Fisher Unwin, the publisher of The Wonders of Instinct in England.