CONTENTS 



PACK 



translator's note ..... vii 



CHAPTER 



I BRAMBLE DWELLERS .... I 



II THE OSMIAE 51 



III THE DISTRIBUTION OF THE SEXES. . 89 



IV THE MOTHER DECIDES THE SEX OF 



THE EGG 124 



V PERMUTATIONS OF SEX . . .155 



VI INSTINCT AND DISCERNMENT . . I92 



VII ECONOMY OF ENERGY . . . . 213 



VIII THE LEAF-CUTTERS ..... 234 



IX THE COTTON-BEES 273 



X THE RESIN-BEES 3OI 



XI THE POISON OF THE BEE . . . 339 



XII THE HALICTI: A PARASITE . . 365 



XIII THE HALICTI : THE PORTRESS . . 393 



XIV THE HALICTI: PARTHENOGENESIS . 422 

 INDEX 451 



