| Chapter I. The Harmas | 67 |
| Chapter I. Bramble-Dwellers | 68 |
| Chapter IV. The Mother Decides the sex of the egg | 54 |
| Chapter XI. The Poison of The Bee | 137 |
| Chapter XII. The Halicti: a Parasite | 48 |
| Chapter VI. The Red Ants | 56 |
| Chapter VIII. Parasites | 50 |
| Chapter IX. The Theory of Parasitism | 48 |
| Chapter X. The Tribulations of The Mason Bee | 120 |
| Chapter I. The Pompili | 47 |
| Chapter II. The Scoliae | 59 |
| Chapter III. A Dangerous Diet | 51 |
| Chapter IV. The Cetonia Larva | 50 |
| Chapter V. The Problem of The Scoliae | 49 |
| Chapter VII. Change of Diet | 84 |
| Chapter VIII. A Dig at The Evolutionists | 42 |
| Chapter IX. Rationing According to Sex | 60 |
| Chapter X. The Bee Eating Philanthus | 53 |
| Chapter XI. The Method of The Ammophilae | 52 |
| Chapter XII. The Method of The Scoliae | 48 |
| Chapter III. The Method of The Calicurgi | 45 |
| Chapter XIV. Objections and Rejoinders | 46 |
| Chapter III. Another Prober (Perforator) | 46 |
| Chapter XI. The Eumenes | 61 |