" 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. Antennae 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 clypeatus_ 103
" 28. Parts of the insect 133
* * * * *
{xi}