| [ CHAPTER 1. ] | BRAMBLE-DWELLERS. |
| [ CHAPTER 2. ] | THE OSMIAE. |
| [ CHAPTER 3. ] | THE DISTRIBUTION OF THE SEXES. |
| [ CHAPTER 4. ] | THE MOTHER DECIDES THE SEX OF THE EGG. |
| [ CHAPTER 5. ] | PERMUTATIONS OF SEX. |
| [ CHAPTER 6. ] | INSTINCT AND DISCERNMENT. |
| [ CHAPTER 7. ] | ECONOMY OF ENERGY. |
| [ CHAPTER 8. ] | THE LEAF-CUTTERS. |
| [ CHAPTER 9. ] | THE COTTON-BEES. |
| [ CHAPTER 10. ] | THE RESIN-BEES. |
| [ CHAPTER 11. ] | THE POISON OF THE BEE. |
| [ CHAPTER 12. ] | THE HALICTI: A PARASITE. |
| [ CHAPTER 13. ] | THE HALICTI: THE PORTRESS. |
| [ CHAPTER 14. ] | THE HALICTI: PARTHENOGENESIS. |
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