OLIVE-SIDED FLYCATCHER. 
CONTOPUS BOREALIS. 
Cuar. Above, dull olive brown, darker on head, paler on rump; tail 
dusky, tipped with gray ; wings dusky, with gray band; lower parts yel- 
lowish white ; flanks pale olive. Length 7% to 8 inches. 
West. Saddled on horizontal limb of tall tree; of twigs and grass lined 
with grass and moss. 
£ggs. 3-5; creamy white, spotted near larger end with reddish brown 
and pale purple; 0.85 X 0.65. 
This remarkable species, which appertains to the group of 
Pewees, was obtained in the woods of Mount Auburn, in this 
vicinity, by Mr. John Bethune, of Cambridge, on the 7th of 
June, 1830. This, and a second specimen acquired soon 
afterwards, were females on the point of incubation. A third 
individual of the same sex was killed on the 21st of June, 
1831. They were all of them fat, and had their stomachs 
filled with torn fragments of wild bees, wasps, and other sim- 
ilar insects. I have watched the motions of two other living 
individuals who appeared tyrannical and quarrelsome even with 
each other; the attack was always accompanied with a whir- 
ring, querulous twitter. Their dispute was apparently, like 
that of savages, about the rights of their respective hunting- 
grounds. One of the birds, the female, whom I usually saw 
alone, was uncommonly sedentary. The territory she seemed 
