66 
SYLVICOLINtE. helinaia. 
mary yellow ; all the lower parts rich yellow^ excepting the sides, 
which are shaded into dull greenish-yellow. 
Male, 5 1, wing, 
North California. 
Delafield’s Yellow-throat, Sylvia Delafieldii, Aud. Ora. Biog. v. v. p. 307. 
GENUS IV. HELINAIA, Aud. SWAMP-WARBLERS. 
Bill rather long, being nearly of the same length as the 
head, straight, or slightly decnrved, 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 upper scutella blended ; toes slender ; claws rather 
long, moderately arched, slender, much compressed, late- 
rally grooved, extremely acute, plumage soft and blended. 
Bristles obsolete. Wings rather long, somewhat pointed, 
the outer three nearly equal, the second longest. Tail of 
moderate length, nearly even. — Name from "EXo?, a swamp, 
and Na/w, to inhabit. 
104. 1. Helinaia Swainsonii, Aud, Swainson’s Swamp- 
Warbler. 
Plate CXCVIII. Male. 
Bill as long as the head, much compressed ; wings rather long, se- 
cond and third quills equal and longest ; tail even ; upper parts olive- 
brown, the head strongly tinged with red ; lower parts and a band 
over the eye pale yellowish-grey, the feathers on the cheeks tipped 
with brown, the sides of the neck and body more grey, the abdomen 
whitish. 
Male, 5i, 8|. 
South Carolina to Massachusetts. Very rare. Migratory. 
Swainson’s Warbler, Sylvia Swainsonii, Aud. Ora. Biog. v. ii. p, 563 ; v. v. p. 462. 
105. 2. Helinaia vermivora, Lath. Worm-eating Swamp - 
Warbler. 
Plate XXXIV. Male and Female. 
