OLIVE-SIDED FLYCATCHER. 

 459. Nuttalornis borealis. 7 l /2 inches. 



These birds can scarcely be called common anywhere, 

 but single pairs of them may be found, in their breed- 

 ing range, in suitable pieces of woodland. I have al- 

 ways 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 (.85 x .65). 



Range. N. A., breeding from the latitude of Massa- 

 chusetts, and farther south in mountainous regions, 

 north to Labrador and Alaska. 



