LIST OF ILLUSTRATIONS IN THE 

 TEXT 



PAGE 



Fig. 1. Bombus, larva and nymph : after Packard 11 



2. Ammophila .. . . . 22 



3-4. Spines on the tarsi of female Ammophila 23 



,, 5. Tubular entrance to hole of wasp . . 25 



6. Basal segments of ants. . . . .33 



7. Rose-leaf partially eaten by bees . . 52 



,, 8. Tufted hairs of hind leg of Andrena . . 67 



,, 9. Corbicula of humble bee . . . 67 



10-12. Cleaning apparatus of bees . ' . 69 



13-18. Hairs of bees, magnified . . 71 



,, 19. Tongues of bees, magnified . . . . 73 



,, 20. Diagram of tongue of bee ... 75 



21. Stylops . . . ... 77 



22. Stylops larva in abdominal cavity of bee . 78 



23. Antennse of " Keyhole " wasps . , . 101 



24. Legs of male " Keyhole " wasps . . 101 



25. Tibia of ~male Crabro cribrarius . . 103 



26. Antennae of male Crabro cribrarius . . 103 



27. Head of male and female Crabro dypeatus . 103 



28. Parts of the insect . .133 



