66 BREWSTER’S WARBLER. 
the chin. All the rest of this brood, like the one shot on the 14th, were leuco- 
bronchiales. 
At this date (July 17) the young birds, though still receiving food from their 
parents, feed themselves freely, both in the trees and in the underbrush, where 
we sometimes observed them basking with outstretched wing in a spot of sun- 
light. They are now more silent than before and their peculiar infantile chirp 
has become distinctly transformed into a note resembling the chirp of the adult 
bird. 
It now remains briefly to consider the third family of Helminthophilae. 
The parents in this case were both normal Golden-wings and all of their 
young, so far as we could discover, were also Golden-wings. Observations 
taken on the seventeenth of July disclosed the young in their autumnal dress. 
One at least was a female, with the throat and sides of the head of a very light 
gray color, but clearly marked off by the much-whiter hue of the breast, sub- 
malar and supra-ocular stripes. The majority of the young were males, now 
similar to the adult male in plumage, but more olivacegus on the back; the 
black throat and cheeks slightly veiled by a yellowish wash; the sub-malar 
stripes, too, met each other broadly under the bill, while in the adult male, as 
was the case in the other two families, the chin was black throughout. At such 
close range were some of these birds observed (July 18) that I could see through 
opera-glasses the sprouting feathers of the wing-coverts as plainly as if the bird 
were in my hand. 
About the twentieth of July the bonds which held these little families to- 
gether were broken. The change was startlingly abrupt. In passing through 
the swamp we were no longer greeted by the chirrupings of the little birds. 
From time to time we might detect a chrysoptera or a leucobronchialis or two, 
perhaps in company with some other kind of warbler, feeding silently, well up 
in the tree-tops, but in most cases it was impossible to decide whether it was an 
old or a young bird. On two occasions, on the 18th and 20th of July, I heard a 
chrysoptera sing three or four times in succession the longer second song of this 
species; this was the only singing of these birds noted since the chrysoptera 
stopped singing on the sixth of June and the lewcobronchialis on the twenty-fourth. 
The Brewster’s Warblers were seen for the last time on August 7; one or two 
Golden-wings were seen on August 8, and a single male on August 21. 
In order to form a Judgment concerning the probability of some of the con- 
clusions arrived at in the foregoing pages the reader should be aware of the 
amount of time spent in making the observations. From the time the young 
