Dr. Coues observed the Yellow-bellied Flycatcher to be a rather rare spring and autumnal visitant at Washington. As specimens were taken there July 28, undoubtedly they occasionally breed there. They appear early in May, and go south the latter part of September.
Two specimens of Flycatcher, identified as of this species, are recorded by Professor Reinhardt as having been taken at Godthaab, Greenland, in 1853.
Sumichrast met with this species in Vera Cruz, but whether as a resident
or only as a migrant he could not determine. Mr. Dresser states that it is common in the summer near San Antonio, arriving there in April. Dr. Coues met it in its migrations through South Carolina. Dr. Turnbull speaks of it as rare in the neighborhood of Philadelphia, where it arrives in the middle of April on its way north. It has been found throughout Eastern Mexico and Guatemala, and as far south as Panama.
Mr. Verrill regarded this species as a summer resident in Western Maine, though he never met with its nest, and at no time very common. Specimens were procured between the last of May and the middle of June. It was found, though very rare, by Mr. McIlwraith, at Hamilton, where it was supposed to be a summer resident. Specimens were taken about the middle of May.
Dr. Hoy detected this species in the summer of 1869, in the vicinity of Racine, and although he had no doubt that they had a nest in the vicinity, he was not able to discover it. He was surprised to find that the male of this species has quite a pretty song. This fact has since been confirmed by the observations of Mr. Boardman, who has heard this bird give forth quite a pleasing, though somewhat monotonous trill. This, according to Dr. Hoy, resembles Pēa-wāyk-pēa-wāyoc, several times repeated in a soft and not unpleasant call or song.
In Western Massachusetts Mr. Allen has found this species rather rare. Those met with have all been taken from May 15 to June 5. Dr. Coues, in his List of the birds of New England, expresses his conviction that this species is probably much less rare than collectors have generally supposed. It harbors very closely in shady woods and thickets, and is very rarely to be met with anywhere else. In the distance it is not easily distinguished from other species of this genus, and may have been allowed to go unsought, mistaken for a much more common species. Mr. Allen has generally met with quite a number each year in May, sometimes several in a single excursion. Mr. Maynard took eight specimens in a few hours, May 31, in Eastern Massachusetts, and Mr. Welch obtained an unusual number in a single season. Dr. Coues has also met with them near Washington during their breeding-season.
At Grand Menan I found the nest of this species in a low alder-bush, on the edge of a thicket, but within a few feet of the shore. The nest was about two feet from the ground, placed in the fork of the bush, and bearing a close resemblance to the nest of the Cyanospiza cyanea. It was loosely made of soft strips of the inner bark of deciduous trees, and lined with yellow stems of grasses. It was not large for the bird, but the conspicuous color of the materials at once betrayed the nest as we chanced to land within a few feet of it. The female immediately slid from it, and was not seen again, but her mate was undisturbed by our presence. Afterwards other nests were obtained at Halifax, on the edge of swampy woods, made of stubble, and placed in low bushes. All the eggs I obtained were white, of a
slightly more chalky hue than those of the minimus, and more oblong. Those procured by Mr. Boardman were sprinkled with minute dots of reddish-brown. Their measurement is .68 by .52 of an inch.
Empidonax flaviventris, var. difficilis, Baird.