GEOTHLYPIS. 521 
d@, Wing 2.65, or more, and exceeding length of tail by at least two- 
thirds the length of the tarsus. 
Adult male: Head, neck, and chest ash-gray, darkest on chest 
and top of head; a continuous white orbital ring; rest of 
lower parts pale yellow. Adult female: Top of head gray- 
ish olive, sides of head more grayish; chin and throat 
brownish white or dull light buffy, deepening into grayish 
brown or brownish gray on chest; orbital ring brownish 
white; otherwise like male. Young in first autumn: Simi- 
lar to adult female, but more tinged with brownish. 
Length 5.20-6.00, wing 2.65-3.00, tail 1.90-2.20, tarsus .75- 
.90. Nest on ground, in swampy woods, very compact. 
Eggs .76 < .54, colored much like those of G. formosa and 
G. philadelphia. Hab. Eastern North America, breeding 
chiefly (entirely?) north of United States; winter resi- 
dence unknown. 
678. G. agilis (Wizs.). Connecticut Warbler. 
ad’, Wing not more than 2.55, and exceeding length of tail by less than 
half the length of the tarsus. 
é. No white on eyelids (except sometimes a slight indication in 
females or immature birds). Adult male: Head, neck, and 
chest deep ash-gray, the throat and chest more or less 
mixed with black, this often forming a distinct patch pos- 
teriorly ; lores dusky or dusky grayish ; rest of lower parts 
pure gamboge-yellow. Adult female: Similar to male, but 
chin and throat dull whitish or brownish white (some- 
times tinged with yellow), the chest dull ash-gray or 
grayish brown (sometimes inclining to dull yellowish); 
rest of head and neck dull gray, brownish gray, or olive. 
Young in first autumn: Similar to adult female, but more 
tinged with brownish, the throat and chest more suffused 
with yellowish. Length 4.90-5.75, wing (male) 2.30-2.55 
(2.42), tail 2.00-2.25 (2.13), tarsus .79-.84 (.81); female 
somewhat smaller (wing 2.15-2.50, tail 1.80-2.05). Nest 
on or near ground, in woods. Hggs .71 x .54, colored like 
those of G. formosa and G. agilis. Hab. Eastern North 
America, breeding from higher Alleghanies, New York, 
New England, Michigan, etc., northward; in winter, south 
to Costa Rica and Colombia (but not Mexico or West 
Indies) ; accidental in Greenland. 
679. G. philadelphia (Wi1s.). Mourning Warbler. 
é. A distinct white spot on each eyelid, in both sexes. Adult 
male : Similar to same sex of G. philadelphia, but lores deep 
black, in conspicuous contrast with the gray, feathers of 
throat and chest margined with paler gray, and chest 
66 $ 
