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 Rio Grande Val- 

 ley of Texas. ) 



Chamaetlilypis 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, TaI)asco, Campeche, and Yucatan. ) 



Chamaethlypis poliocephala palpebralis, adult male and female (p. 689) 

 bb. Crown grayish brown, Ijut t^lightly different from color of back; lores not black. 

 (Immature male and female.'') 

 aa. No white or yellow marks on eyelids. {Chrim<rthJypis caninucha.) 

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



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

 bb. Crown olive or olive-brown, like l)ack; lores not black. 



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



CHAMiETHLYPIS POLIOCEPHALA POLIOCEPHALA (Baird). 

 RALPHS GROtTKD-CHAT. 



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

 ing beneath the lower eyelid and sometimes narrowly crossing- the 

 anterior portion of forehead; pileuni gra\' (no. 6), narrowly and indis- 

 tinctly streaked with olive, passing gradually into dull gra3'ish olive- 

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

 tail-coverts, and tail brighter, more yellowish, olive-green; upper eye- 

 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 

 3^ellow (much paler in worn plumage), fading into buffy whitish on 

 abdomen ; sides and flanks light huffy 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 i?i autumn and winter. — Similar to the spring and sunnner 

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

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

 tipped with ])rown, and flanks more decidedly buffy. 



Immature male and 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 specimenss of C p. poliocephala examined. 



