CONTENTS 



PAGE 



translator's note . . . ;. . vii 



I THE MASON-BEES I 



II EXPERIMENTS ....... 30 



III EX'CHANGING THE NESTS . . .56 



IV MORE ENQUIRIES INTO MASON-BEES 73 

 V THE STORY OF MY CATS 1. i. . I09 



VI THE RED ANTS 1 24 



VII SOME REFLECTIONS UPON INSECT 



PSYCHOLOGY . ^. . . . I58 



VIII PARASITES 190 



IX THE THEORY OF PARASITISM . . 217 



X THE TRIBULATIONS OF THE MASON- 

 BEE 250 



XI THE LEUCOSPES . ;. ,.. . . 277 



INDEX .., ., ,., 1., I., 1. 1 I., i.i I. 311 



