NESTING-HOUSES 31 



have enlarged the holes to bluebird boxes so that 

 they could get in, but the boxes were too small 

 to nest in. 



In Burns's monograph on the flicker are given 

 the following figures regarding the inside dimen- 

 sions of flickers' nests, the data being gathered 

 from various sections of the United States : 



Minimum. Maximum. Average. 



Diameter of entrance 2.20 5.00 3.28 



Diameter of cavity near bottom 4.50 10.00 7.67 



Depth of cavity from entrance 6.00 36.00 15.79 



Total length of cavity 9.00 40.00 18.50 



The figures given in the average column will 

 suggest the dimensions of a nesting-box for the 

 flicker. 



Crested Flycatcher. The author has found 

 five records of the nesting of the crested fly- 

 catcher in boxes. One pair nested in the hollow 

 limb described on page 44, after it had been left 

 by the titmice. It was also used the following 

 season by the flycatchers. In two other cases 

 these birds nested in one of the compartments of 

 a martin-house. 



Mrs. G. K. Holmes, of Summit, New Jersey, 

 reports a pair nesting in a box in the spring of 

 1908. " It was a little house of about six and one 

 half by eight and one half inches, with an opening 



