PLATE XXXIV. 



Fig. 1. — Vertical section of a nest of Pt. 5-faciatus; eggs suspended in 

 cells. 



Figs. 2, 3 and 4. — Vertical sections of nests of O. ciorsalis, opening in 

 level ground; eggs suspended in some cells. 



Fig. 5. — Vertical section of nest of O. dofsalis, opening in face of bank. 



Figs. 6 and 7. — Vertical sections of nests of 0. arvensis; tube over 

 entrance. 



Fig. 8. — Nest of Eumenes on a rock. 



Figs. 9 and 10. — Nests of E. bolli. 



Fig. 11. — Earthen bank inhabited by O. hildapi and by a colony of 

 O. papagorum. Photo by F. X. Williams. 



