LIST OF ILLUSTRATIONS
| Male Oriental rat–flea | [frontispiece] | |
| FIGURE | PAGE | |
| 1. | The larva of a flea | [6] |
| 2. | Types of genal and thoracic combs of a flea | [26] |
| 3. | The hind leg of a flea | [30] |
| 4. | The mouth-parts of a flea | [43] |
| 5. | The antenna of a flea | [47] |
| 6. | The alimentary canal of a flea | [53] |
| 7. | The head of a female dog-flea and a female cat-flea | [71] |
| 8. | Pregnant female of Dermatophilus cæcata | [81] |