Species XXI. SYLVIA AUTUMNALIS. 
AUTUMNAL WARBLER. 
[Plate XXIII. Fig. 4 ] 
This jplain little species regularly visits Pennsylvania from the north 
in the month of October, gleaning among the willow leaves ; hut what 
is singular, is rarely seen in spring. From the first to the fifteenth of 
October, they may be seen in considerable numbers almost every day in 
gardens, particularly among the branches of the weeping willow, and 
seem exceedingly industrious. They have some resemblance in color to 
the Pine-creeping Warbler ; but do not run along the trunk like that 
bird ; neither do they give a preference to the pines. They are also 
less. After the first of November they are no longer to be found, 
unless the season be uncommonly mild. These birds doubtless pass 
through Pennsylvania in spring, on their way to the north ; but 
either make a very hasty journey, or frequent the tops of the tallest 
trees ; for I have never yet met with one of them in that season ; 
though in October I have seen more than a hundred in an afternoon's 
excursion. 
Length four inches and three quarters, breadth eight inches ; whole 
upper parts olive green, streaked on the back with dusky stripes ; tail 
coverts ash, tipped with olive ; tail black, edged with dull white ; the 
three exterior feathers marked near the tip with white ; wings deep 
dusky, edged with olive, and crossed with two bars of white ; primaries 
also tipped, and three secondaries next the body edged, with white ; 
upper mandible dusky brown ; lower, as well as the chin and breast, 
dull yellow ; belly and vent white ; legs dusky brown ; feet and claws 
yellow ; a pale yellow ring surrounds the eye. The males of these 
birds often warble out some low, but very sweet notes, while searching 
among the leaves in autumn. 
Vol. II. — 13 
(19S) 
