LIST OF ILLUSTRATIONS 



PAGE 



1. Pompilus viaticus ........ 14 



2. Ammophila sabulosa ........ 21 



3. Oxybelus uniglumis ........ 25 



4. Wings of a Hymenopteron and Crabro .... 29 



5. Odynerus parietum ........ 37 



6. Nest of Odynerus ........ 39 



7. Diagram of wasp's nest at an early stage ... 43 



8. Diagram of wasp's nest towards the end of summer . 46 



9. Back view of mouth parts of Colletes and Andrena . . 59 



10. Front view of mouth parts of Bombus .... 61 



11. Colletes succincta ........ 62 



12. Last segment of abdomen of female Halictus ... 67 



13. Dasypoda hirtipes ........ 71 



14. Portion of a rose-leaf which has been attacked by a leaf- 



cutter bee (Mtgachile) ...... 79 



15. Three cells of leaf-cutter bee (Megachile) in a piece of 



rotten wood ........ 80 



16. Eucera lonyicornis . . . . . . . .86 



17. Honey-bee. A, outer aspect of hind leg. B, inner aspect 



of metatarsus and lower part of tibia of hind leg. 

 C, junction of tibia and metatarsus of middle leg, 



showing spur ........ 105 



18. Ventro-lateral view of sting of Vespa germanica ? . . 109 



19. Diagrammatic cross-section of a wasp's sting . . . 110 



20. Optical section of tip of a needle from the sting of Vespa 



germanica ? ........ 110 



21. Diagram of side view of bee's head to show disposition 



of the mouth parts ....... 115 



