LIST OF ILLUSTRATIONS. 



Plate I. 

 Figures : 



1. Nest and Wasps, Polistes bellicosus; x 5-6. 



2. Remhex spinolae and Microbembex monodonta. Nat. size. 



3. j\lud cells of Odyncrus dorsalis ; the open cell is being stored with 



caterpillars. Nat size. 



4. Same, next day ; wasp in cell made afternoon before. Nat size. 



5. (Spider placed on leaf by Fompilus marginatus for safe keeping. 



xyo. 



G Ammophila !)■ ginning her nest. Nat. size. 



Plate II. 



7. Monediila Carolina coming out of nest. Nat. size. 



8. Ammophila carrying chip of wood to throw into the nest on left 



of figure. A little larger than nat. size. 



9. Caterpillar, prey of Ammophila, on left; full grown wasp grub and 



remnant of another caterpillar nearly devoured. About nat. 

 size. 



10. ]\Iud cells of Odijnerns dorsalis; open cell shows wasp grub eating 



on caterpillars. Nat size. 



11. Same, showing holes by which young wasps emerged. Nat. size. 



12. Prey of Ponipiliis marfjinains removed from nest, showing posi- 



tion of wasp's egg. Nat. size. 

 1.3. Ammophila at work; nest deepening; see Fig. G. 



14. Bugs, ])rey of Bcinhcx helfraegi, showing egg of wasp. Nat. size. 



Plate III. 



15. Cocoon of Moncdula Carolina surrounded by remains of ilies de- 



voured by wasp larva. x%. 

 IG. Ammophila carrying caterpillar, x 1 1-3. 



17. Ammophila nests close together; nests of wasps No. 72 and No. 73. 



Nat. size. 



18. Nest of Ammophila, cross-section, showing debris in tunnel, cater- 



pillar in pocket and position of egg. One-half nat. size 

 ]!). Nest of Bemhidula pieiifrons, showing bugs in pocket. One-fourth 

 nat. size. 



20. Prey of Agenia; spider with legs amputated and egg of wasp. 



Nat. size. 



21. Nest of MonrdiiUt Carolina. One-fifth nat. size. 



Plate IV. 



'22. Nest of AmiitojiJiila, showing cxcavatiil dirt at x 1-3 nat, size. 



23. Trjipoxylon texense, male and female, occupying deserted mud- 



dauber's nest. Nat. size. 



24. Pil in ground sliowiiig wasj) l>urrows. Otu-tliird nat. size. 



