OLIVE-SIDED FLYCATCHER. 
459. Nuttalornis borealis. 7% 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 ric’ 
creamy ground, spotted about the large end with brow 
and lavender (.85 x .65). 
Range.—N. A., breeding from the latitude of Mass 
chusetts, and farther south in mountainous regio: 
north to Labrador and Alaska. 
