PLATE XXXV. 



Fig. 12. — Vertical section of nest of O. hildagi. 



Fig. 13. — Cell of nest of O. hildagi. 



Fig. 14. — Vertical section of nest of O. annulatus; tube over entrance. 



Fig. 1-5. — Vertical section of nest of O. annulatus; all parts brought 

 into one plane; tube removed. 



Fig. 16. — Tube over entrance to nest shown in figure 15. 



Fig. 17. — Tube extending from bank over entrance of nest of O. 

 papagonim. 



Figs. 18 and 19. — Horizontal sections of burrows of O. papagorum, 

 showing arrangement of entrances of cells and galeries into main burrow. 



Figs. 20 and 22. — Vertical sections of nests of O. papagorum, with 

 tubes over entrance. 



Fig. 21. — Vertical section of lower part of a nest of O. papagorum; 

 eggs in cells. 



Fig. 2.3.— Nest of E. fraternus. 



