628 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Gleothlypis'] agilis Ridgway, Man. N. Am. Birds, 1887, 521. 



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



(Chester Co., Pennsylvania). 

 (?) Geothlypis tephrocotis Baknakd, Ann. Rep. Smithaon. Inst, for 1860 (1861), 435 



(Chester Co., Pennsylvania). 

 (?) Oporornis varius Blakiston, Ibis, 1863, 61 (Mackenzie R.). 



OPORORNIS PHILADELPHIA (Wilson). 

 UOURITENG WARBLER. 



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

 deepening into slate color on pileutn and hindneok, and into almost 

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

 or less distinct terminal margins of slate-graj'', these sometimes so broad 

 anteriorly and laterally that the black is mainly concealed, except on 

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

 on sides and Hanks; upper parts, except pileinn and hindneck, uniform 

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

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

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

 skins (pale flesh color in life?). 



Adult male 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 only as a broken patch on the chest. 



Adult female in spring 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 witb 

 olive; yellow of under parts slightly paler. 



Young female in first autumn.— SimQ&r 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 eyelids 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 grayish. 



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

 Rest of upper parts, with 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 suffusion, 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 fly. 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 exhibited 

 much solicitude. This spetimen is separable from the corresponding 



