OLIVE-SIDED FLYCATCHER. 



459. Nuttalornis borealis. 7}/ 2 inches. 



These birds can scarcely be called common any- 

 where, but a single pair of them may be usually found, 

 in their breeding range, in every suitable piece of 

 woodland. I have always found them in dead pine 

 swamps, where the trees were covered with hanging 

 moss, making it very difficult to locate their small 

 nests. Their peculiar, loud, clear whistle can be heard 

 for a long distance and serves as a guide-board to their 

 location. 



Note. A loud, clear whistle whip-wheeu, the first 

 syllable short and sharp, the last long and drawn out 

 into a plaintive ending. 



Nest. A small structure for the size of the bird, 

 made of twigs and mosses firmly anchored to horizon- 

 tal limbs or forks. Three to five eggs are laid; a rich 

 creamy ground, spotted about the large end with 

 brown and lavender (.85x.65). 



Range. N. A., breeding from the latitude of Mass., 

 and farther south in mountainous regions, north to 

 Labrador and Alaska. 



