Translator's Note 



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. 



My thanks are due to the late Miss 

 Frances Rodwell and to my friend Bernard 

 Miall, both of whom have been of great as- 

 sistance to me in preparing my translation. 



Alexander Teixeira de Mattos. 

 chelsea, 1 8 April, 19 19. 



VI 



