Mason Bees Depositing eggs NOTE: I have updated this 2015 post in order to make it appear closer to the other mason bee information By early May many of the tubes are full and capped with mud. Here a female mason bee searches for the last hole she has been filling to deposit eggs or mud Backing in a tube to deposit the egg. Going in head first, probably meaning she is carrying mud to seal a compartment. Almost all the tubes are filled and capped in this section . NOTE: In 2024Â I have re-dated this post in order to place it closer to the other mason bee posts ..