OF EASTERN PENNSYLVANIA. 159 



it builds either upon the ground, like the Yel- 

 low Throat, or else upon small bushes; for as a 

 rule subject to some exceptions, however, the site 

 fora nest measurably depends upon the terrestrial 

 or non-terrestrial habits of a species. Birds that 

 generally feed high up in trees, usually nidificate 

 in such places; those that feed within small trees 

 and low bushes, build low down; whereas, species 

 that are eminently terrestrial in their habits of 

 feeding, or frequent very low bushes, build most 

 generally either upon the ground within a tussock 

 of grass, or in a concavity in the soil artfully con- 

 cealed by dry leaves; but, occasionally, a nest is 

 built upon a low bush. In "North American 

 Birds" we learn that a nest of this species was 

 discovered by John Burroughs, Esq., of Washing- 

 ton, " near the headwaters of the Delaware river 

 in Roxbury, Delaware Co., N. Y." It was placed 

 "in some ferns about one foot from the ground." 

 From the very close resemblance which obtains 

 between the breeding-habits of this species and 

 those of trichas, it would be remarkably strange if 

 it should deviate very widely from the latter in 

 habits of nidification. 



The nest alluded to was built in a hemlock wood ; 

 it was rather massive, and was composed of dry 

 stalks and leaves, externally; its cavity was quite 

 deep and was lined with fine black roots. 



It has been known to breed in Waterville, 

 Maine, and there are good reasons for supposing 

 that it breeds in Vermont, as Mr. Paine has ob- 



