BIRDS OF NORTH AND MIDDLE AMERICA. 687 



c. Duller olive-green above; paler yellow below, the abdomen and anal region 

 distinctly paler (often buffy whitish); wing and tail longer, bill and feet 

 smaller (wing averaging 58.2, tail 62.2, exposed culmen 11.5, tarsus 21.6 in 

 male; 54.5, 59.5, 11.5, and 20.8 in female). (Mexico in general, from States 

 of Morelos and Michoacan north to Sinaloa and to lower Eio Grande Val- 

 ley of Texas. ) 



ChamaetUypis poliocephala poliocephala, adult male and female (p. 687) 



cc. Brighter olive-green above, brighter and wholly yellow' below; wing and 



tail shorter, bill and feet larger ( wing averaging 55.6, tail 59.9, exposed 



culmen 12.3, tarsus 22.2 in male).^ (Southeastern Mexico, from State of 



Vera Cruz to Chiapas, Tabasco, Camp^che, and Yucatan. ) 



Chamsetlilypis poliocepliala palpebralis, adult male and female (p. 689) 

 bb. Crown grayish brown, but slightly different from color of back; lores not black. 

 (Immature male and female.') 

 aa. No white or yellow marks on eyelids. ( Chamsethlypis caninucha. ) 

 b. Crown gray; lores black. (Guatemala to Chiriqui.) 



Chamaethlypis caninucha, adult male and female (p. 689) 

 66. Crown olive or olive-brown, like back; lores not black. 



Ohamaethlypis caninucha, immature male and female (p. 689) 



CHAM.ffi;THLYPIS POLIOCEPHALA POLIOCEPHALA (Baird). 

 RALPH'S GKOTJlfD-CHAT. 



Adults in spring and summer {sexes alike). — Lores black, this extend- 

 ing beneath the lower ej^elid and sometimes narrowly crossing the 

 anterior portion of forehead; pileum gray (no. 6), narrowly and indis- 

 tinctly streaked with olive, passing gradually into dull grayish olive- 

 green on back, scapulars, wing-coverts, and tertials; primaries, upper 

 tail-coverts, and tail brighter, more yellowish, olive-green; upper 63^6- 

 lid white for posterior half or more, lower eyelid white for its entire 

 length; auricular region grayish, tinged with olive, the lower portion 

 more yellowish; malar region, chin, throat, chest, and breast canary 

 yellow (much paler in worn plumage), fading into buffy whitish on 

 abdomen; sides and flanks light buff'y olive; under tail-coverts pale yel- 

 low; thighs similar in color to flanks, but paler; maxilla dusky brown 

 with paler tomia; mandible pale brownish (pale flesh color or lilaceous 

 in life?); legs and feet pale buffy brown (in dried skins). 



Adults in autumn and winter. — Similar to the spring and summer 

 plumage, but plumage softer, more blended; back, etc., more buffy 

 olive or light olive-brown; feathers of pileum (at least the occiput) 

 tipped with brown, and flanks more decidedly buffy. 



Immature male am,d female. — Similar in general to the adult plum- 

 age, but duller, the pileum concolor with back, or nearly so, and lores 

 dull brownish gray or dusky, not distinctly different from color of 

 pileum. 



' Except on sides, flanks, and thighs, which are brownish buffy or buffy olive. 



'^ No females of this form seen by me. 



' Only immature specimens of C p. poliocepliala examined. 



