| Chapter III. The Distribution of Sexes | 1676 |
| Chapter XII. The Halicti: a Parasite | 1854 |
| Chapter VIII. Parasites | 1855 |
| Chapter IX. The Theory of Parasitism | 1767 |
| Chapter X. The Tribulations of The Mason Bee | 2668 |
| Chapter III. Another Prober (Perforator) | 2602 |
| Chapter XVI. A Parasite of The Maggot | 2582 |
