LIST OF ILLUSTRATIONS. 
Plate I. 
Figures : 
1. Nest and Wasps, Polistes bellicosus ; x 5-6. 
2. Bembex spinolae and Microbembex monodonta. Nat. size. 
3. Mud cells of Odynerus 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 Pompilus marginatus for safe keeping. 
x%, 
'6 Ammophila beginning her nest. Nat. size. 
Plate II. 
7. Monedula 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. Mud cells of Odynerus 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 Pompilus marginatus removed from nest, showing posi- 
tion of wasp’s *egg. Nat. size. 
13. Ammophila at work; nest deepening; see Fig. 6. 
14. Bugs, prey of Bembex belfraegi, showing egg of wasp. Nat. size. 
Plate III. 
15. Cocoon of Monedula Carolina surrounded by remains of flies de- 
voured by wasp larva. x%. 
16. 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 Amm,ophila, cross-section, showing debris in tunnel, cater- 
pillar in pocket and position of egg. One-half nat. size. 
19. Nest of Bembidula pictifrons, 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 Monedula Carolina. One-fifth nat. size. 
Plate IV. 
22. Nest of Ammophila, showing excavated dirt at x 1-3 nat. size. 
23. Trypoxylon texense, male and female, occupying deserted mud- 
dauber’s nest. Nat. size. 
Pit in ground showing wasp burrows. One-third nat. size. 
24 . 
