GEOTHLYPIS. 521 



d 1 . 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 X -54, colored much like those of Cr. formosa and 

 Gr. Philadelphia. Hob. Eastern North America, breeding 

 chiefly (entirely?) north of United States; winter resi- 

 dence unknown. 



678. G. agilis (WiLs.). Connecticut Warbler. 



d 1 . Wing not more than 2.55, and exceeding length of tail by less than 



half the length of the tarsus. 



e 1 . 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 gambogeTyellow. 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-.S4 (.81); female 

 somewhat smaller (wing 2.15-2.50, tail 1.80-2.05). Nest 

 on or near ground, in woods. Eggs .71 X -54, colored like 

 those of G. formosa and Cr. agilis. Hab. Eastern North 

 America, breeding from higher Alleghanies, New York, 

 New England, Michigan, etc., northward ; in winter, south 

 to Costa Eica and Colombia (but not Mexico or West 

 Indies) ; accidental in Greenland. 



679. G. Philadelphia (WiLs.). Mourning Warbler. 



e*. 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 



