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I. The Sacred Beetle 1
II. The Enclosure 27
III. Cerceris Bupresticida 40
IV. Cerceris Tuberculata 51
V. One Skilful to Slay 67
VI. The Yellow-winged Sphex 80
VII. Three Strokes of a Dagger 93
VIII. Larva and Nymph 101
IX. Advanced Theories 116
X. The Sphex of Languedoc 132
XI. The Science of Instinct 146
XII. The Ignorance of Instinct 164
XIII. An Ascent of Mont Ventoux 179
XIV. The Emigrants 193
XV. The Ammophila 205
XVI. The Bembex 219
XVII. Hunting Diptera 233
XVIII. A Parasite—The Cocoon 243
XIX. The Return to the Nest 258
XX. Mason Bees 271
XXI. Experiments 289
XXII. An Exchange of Nests 306
Descriptive Notes 317