NATURE'S CRAFTSMEN 



quite the same. They steal into their neighbors' homes 

 and drop their eggs within the cells. When the larvse 

 appear they feed upon the pollen-mass prepared for the 

 young Andrena or Halictus. It woukl seem that there 

 is, for the most part, enough bee-bread for the families of 

 both the host and the guest, which is no credit to the 

 robbers, and that the young live peacefully together, 

 which, perhaps, may be reckoned a virtue, as virtues 

 go among cuckoo bees. 



Another form of nest-architecture among these soli- 



MUD-PELLET CELLS OF A MASON BEE (OSMLA.) BUILT IN A STONE- 

 HEAP 



156 



