| Chapter I. The Harmas | 3098 |
| Chapter I. Bramble-Dwellers | 2578 |
| Chapter IV. The Mother Decides the sex of the egg | 1869 |
| Chapter XI. The Poison of The Bee | 3413 |
| Chapter XII. The Halicti: a Parasite | 1851 |
| Chapter VI. The Red Ants | 2097 |
| Chapter VIII. Parasites | 1853 |
| Chapter IX. The Theory of Parasitism | 1765 |
| Chapter X. The Tribulations of The Mason Bee | 2660 |
| Chapter I. The Pompili | 8177 |
| Chapter II. The Scoliae | 1697 |
| Chapter III. A Dangerous Diet | 2696 |
| Chapter IV. The Cetonia Larva | 6324 |
| Chapter V. The Problem of The Scoliae | 1508 |
| Chapter VII. Change of Diet | 5905 |
| Chapter VIII. A Dig at The Evolutionists | 4862 |
| Chapter IX. Rationing According to Sex | 3517 |
| Chapter X. The Bee Eating Philanthus | 2775 |
| Chapter XI. The Method of The Ammophilae | 1570 |
| Chapter XII. The Method of The Scoliae | 2329 |
| Chapter III. The Method of The Calicurgi | 2379 |
| Chapter XIV. Objections and Rejoinders | 1686 |
| Chapter III. Another Prober (Perforator) | 2600 |
| Chapter XI. The Eumenes | 2752 |