82 
DELAFIELD’S GROUND-WARBLER. 
shorter than it ; the other primaries very slowly graduated, the longest or 
third being only five- twelfths longer than the first secondary ; all the quills 
are rounded. Tail rather long, straight, much rounded, the lateral feathers 
being half an inch shorter than the middle. 
Upper mandible blackish-brown, with the edges yellowish flesh-colour; 
lower mandible of the latter colour, slightly dusky at the point. A band of 
black passes across the forehead, includes the loral space and eyes, and 
terminates on the ear-coverts. The upper part of the head is light greyish- 
blue, tinged behind with green ; the rest of the upper parts dull greyish-olive ; 
the quills and tail-feathers wood-brown, the edge of the wing and the margin 
of the outer primary, yellow. The fore part of the neck, and all the lower 
parts, rich yellow, excepting the sides, which are shaded into dull yellowish- 
green, and the lower wing-coverts and axillaries, which are nearly white. 
Length to end of tail 5i inches ; bill along the ridge f|, along the edge of 
lower mandible T ® 3 ; wing from flexure 2 r %; tail 2?; tarsus hind toe f|, 
its claw * 4 ; middle toe its claw 
This species has the bill much stronger and more elongated than Trichas 
Marilandica ; its wings are much more rounded, the first quill being nearly 
five twelfths shorter than the third, whereas in the latter it is scarcely a 
twelfth and a half shorter ; its tail is more rounded ; and its tarsi and toes 
are proportionally larger. The colours are, however, similar ; but the pre- 
sent species has no whitish band margining the black band on the head, and 
this latter band is much narrower in front, and does not proceed so far down 
the neck, extending only to the distance of four and a half twelfths from the 
eye, whereas in T. Marilandica it extends to the distance of half an inch. 
GENUS IV. — HELINAIA, And. SWAMP- WARBLERS. 
Bill rather long, being nearly of the same length as the head, straight, or 
slightly decurved, tapering to a very acute point, much compressed; the 
upper mandible with the ridge distinct, the sides declinate and flat at the 
base, the edges somewhat inflected beyond the middle, the notch obsolete, 
lower mandible with the dorsal line straight, the edges involute, the tip 
extremely acute. Nostrils oblong ; exposed. Feet of moderate length ; tarsus 
about equal to the middle toe and claw, slender, much compressed, with the 
