Plate IV 



9 





12 



- I 



" 15 



13 



18 



17 



Fig. 11. A deserted mud-dauber's nest, the cells used by 0. cordata and the openings 



resealed with waxy material. Natural size. 

 Fig. 12. Pupal cocoons of T. albitarsis after having been used by 0. cordata; a, 



complete pupal case with old opening resealed with wax; b, waxy plug removed, 



showing hole made by emerging 0. cordata; c, part of cell opened to show pupal 



case of 0. cordata; d, cell of T. albitarsis opened to show partitions and plug of waxy 



substance. Natural size. 

 Fig. 13. Mud balls taken from the mandibles of mud-daubing wasps. 

 Fig. 14. Longitudinal section of mud-dauber's nest showing the pupal cases of 0. cordata 



between the waxy partitions. Natural size. 

 Fig. 15. Pupal cases of 0. cordata taken from deserted cells of mud-daubers' nests. 

 Fig. 16. Pupal cases of T. clavatum. 

 Fig. 17. Old nest of mud-dauber, with two mud partitions, and mud plug in old opening 



made by 0. lignaria. 

 Fig. 18. Nest of mud-dauber, showing decorations of mud pellets. Reduced one-half. 



