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 ccecata . 81 



