| | PAGE |
| The Subject in General, | [1] |
| The Solitary Groups, | [6] |
| The Solitary Bees, | [9] |
| The Cuckoo Bees, | [14] |
| The Fossors, or Diggers, | [18] |
| The Solitary Wasps, | [24] |
| The Social Groups, | [28] |
| The Ants, | [31] |
| The Social Wasps, | [35] |
| The Humble Bees, | [39] |
| The Bees With Bifid Tongues, | [44] |
| The Bees with Pointed Tongues, | [48] |
| Leaf-Cutting Bees, | [52] |
| Osmia and Its Habits, | [55] |
| A Colony of Anthophora, | [61] |
| Bees and Pollen-Collecting, | [65] |
| On Bees' Tongues, and how They suck Honey, | [72] |
| A Dreadful Parasite, | [77] |
|
Amongst the Bees at Work, | [81] |
| Ants, their Guests, and their Lodgers, | [88] |
| How can an "Aculeate" be Recognized?, | [92] |
| Males and Females, | [95] |
| The Vagaries of Colour and Structure in the Sexes, | [100] |
| The Distribution, Rarity, or Abundance of Various Species, | [105] |
| On Bees' Wings, | [110] |
| On Breeding Aculeates, etc., | [113] |
| On Colour, | [119] |
| The Development of Insects from the Egg, | [124] |
| On Structure, | [132] |
| Index, | [141] |