3 o8 



WASP STUDIES AFIELD 



In the vicinity of the turret just described, we found in 

 the bare ground some plugs of mud sealing former holes. 

 These were no longer a mystery to us after we had seen O. 

 geminus break down her chimney, make mud of it and 





FIG. 57. Burrows of Odynerus geminus in various stages of con- 

 struction. Natural size. 



close the hole flush with the surface. Near each of these 

 were strewn twelve or fifteen old pellets of mud of the type 

 which geminus always throws away when excavating her 

 chamber. The first nest which we dug out seemed a per- 

 fect piece of work. Clustered around the base of the vertical 



