BLACK-THROATED WARBLER. 
67 
tlie shortest. AYings are tolerably pointed ; the first and 
fourth primaries are of equal length, the second and 
third only a trifle longer; the second, third, and fourth 
are near the tips of the outer web very strongly 
notched. 
The whole length of the bird, from the forehead to 
the point of the tail, five inches; length of the wing 
in repose two inches and six lines; of the tail two 
inches; an inch of the tail uncovered by the wings. 
Beak five lines; tarsus nine lines; middle toe three 
lines; claws two lines; hinder toe three lines, and the 
very curved claw of ditto two lines and a half.” 
The bird has been preserved in spirits. 
Sylvia virens belongs to the group of Leaf Warblers, 
but as its existence in Europe was not known by me 
sufficiently early to place it in that section, I have 
introduced it here, rather than defer a notice of it to 
the end of the work. Its habits are so well described 
by Audubon, that I take the liberty of transcribing the 
following from his large octavo work upon the “'Birds 
of America.” 
“I have traced this species from Texas to New- 
foundland, although at considerable intervals, along our 
Atlantic coasts, it being of rare occurrence, or wanting 
in some parts, while in others it is abundant: but in 
no portion of the United States have I met with it 
so plentiful as around Eastport, in Maine, where I saw 
it in the month of May. Many remain all summer in 
that State, as well as in IMassachusetts and the northern 
parts of New York; and some are found at that season 
even in the higher portions of Pennsylvania. On the 
coast of Labrador it was not observed by me or any of 
my party; and it is not mentioned by Dr. Bichardson, 
as having been seen in the Fur Countries. Its habits 
