| Chapter I. The Harmas | 1034 |
| Chapter I. Bramble-Dwellers | 775 |
| Chapter IV. The Mother Decides the sex of the egg | 742 |
| Chapter XI. The Poison of The Bee | 1614 |
| Chapter XII. The Halicti: a Parasite | 714 |
| Chapter VI. The Red Ants | 768 |
| Chapter VIII. Parasites | 605 |
| Chapter IX. The Theory of Parasitism | 642 |
| Chapter X. The Tribulations of The Mason Bee | 921 |
| Chapter I. The Pompili | 959 |
| Chapter II. The Scoliae | 655 |
| Chapter III. A Dangerous Diet | 1250 |
| Chapter IV. The Cetonia Larva | 1180 |
| Chapter V. The Problem of The Scoliae | 676 |
| Chapter VII. Change of Diet | 656 |
| Chapter VIII. A Dig at The Evolutionists | 1207 |
| Chapter IX. Rationing According to Sex | 1006 |
| Chapter X. The Bee Eating Philanthus | 545 |
| Chapter XI. The Method of The Ammophilae | 574 |
| Chapter XII. The Method of The Scoliae | 613 |
| Chapter III. The Method of The Calicurgi | 950 |
| Chapter XIV. Objections and Rejoinders | 704 |
| Chapter III. Another Prober (Perforator) | 775 |
| Chapter XI. The Eumenes | 795 |