628 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



G\_rothliip'i!(] agilis Ridgway, Man. N. Am. Birds, 1887, 521. 



(?) Trichas tephrocotis Nuttall, Man. Orn. U. S. and Can., 2d ed., 1840, 462 

 (Chester Co., Pennsylvania). 

 . (?) Geothlypis tephrocotis Barnard, Ann. Rep. Smithson. Inst, for 1860 (1861), 435 

 (Chester Co., Pennsylvania). 

 (?) Opo wi'nis varius Blxkiston, Ibis, 1863, 61 (Mackenzie R. ). 



OPORORNIS PHILADELPHIA (Wilson). 

 MOURNING WARBLER. 



Adult male in spring and summer. — Head and neck plain slate-graj^ 

 deepening into slate color on pileum and hind neck, and into almost 

 black on lores; chin, throat, and chest black, the feathers with more 

 or less distinct terminal margins of slate-gTa3% these sometimes so broad 

 anteriorly and laterally that the black is mainl}^ concealed, except on 

 chest; rest of under parts clear canary yellow, changing to olive-green 

 on sides and flanks; upper parts, except pileum and hindneck, uniform 

 olive-green, the outermost primary edged with whitish ; maxilla brown 

 ish black with paler tomia; mandible pale brown or horn color (in 

 dried skins); iris brown; legs and feet pale yellowish brown in dried 

 skins (pale flesh color in life?). 



Adult nude in autumn and winter. — Similar to the spring and sum- 

 mer plumage, but (always?) with gray tips to feathers of throat and 

 chest broader, the black appearing onl}^ as a broken patch on the chest. 



Adult female in sprimj and summer. — Similar to the adult male, but 

 without any black on chin, throat, or chest, which are smoke gray, 

 much paler (sometimes brownish white) on chin and part of throat; 

 slate color of pileum and hindneck duller, tinged more or less with 

 olive; yellow of under parts slightly paler. 



Young female in first mdumn.- — Similai* to the adult female, but with- 

 out any gray on head, neck, or chest; pileum and hindneck olive-brown- 

 ish; sides of head and neck similar but paler, the e3"elids dull pale 

 yellow; an indistinct supraloral streak of yellowish; chin, throat, and 

 chest yellowish (duller or paler than under parts of body), tinged 

 laterally with olive or gra^^sh. 



Young female., first plumage. — " Remiges, rectrices, etc., as in adult. 

 Rest of upper parts, Avith wing-coverts and sides of head, dull reddish- 

 brown, becoming almost cinnamon on the back, and tinged strongly 

 with ashy on the pileum. Entire under parts light reddish-brown, 

 most pronounced on the abdominal and anal regions, becoming lighter 

 on the throat, and darker, with a strong olive sufi'usion, on the breast 

 and sides. No appreciable maxillary or supraorbital stripes. From 

 a specimen in my collection shot at Upton, Maine, August 11, 1876. 

 This bird was very young; in fact, barely able to ^\. A slight doubt 

 exists in my mind as to its identity, for 1 did not actually see the parent 

 birds feed it, though both were in the immediate vicinity and exhil)ited 

 much solicitude. This specimen is separable from the corresponding 



