259 



Fig. 221. One of them ivas very modest and tried to back 

 doum out of sight. 



the intrusion. A closer inspection of Downy's nest brought 

 to my attention a fourth family occupj'ing the top flat. A 

 small colony of wood-boring bees had taken possession of 

 the decaj'ed interior of the limb about two feet above the 

 entrance to the woodpecker nest. A number of small holes 

 furnished the doors to this apartment; from these doors, 

 from time to time, came tiny clouds of dust resembling 

 smoke, showing that the occupants were still at work with 

 their excavating. 



Never did apartment block have more congenial surround- 



