BIRBS OF NORTH AND MIDDLE AMERICA. 661 



gg. Under parts entirely yellow; larger (wing and tail more than 55). 

 Geothlypis trichas melanops, adult female (p. 673) 

 ff. Lai^er (wing more than 57, exposed culmen not less than 12.9, usually 

 much more). 

 g. Bill smaller (exposed culmen 12.9-13.7). 



Geothlypis beldingi, adult female (p. 679) 

 gg. Bill larger (exposed culmen 14.5-15.5). 



/(. Under parts with more or less of whitish on abdominal region; fore- 

 head and superciliary region very slightly if at all tinged with 

 yellow. 

 i. Throat and chest pale dull yellow, or pale dull huffy tinged 

 with yellow; back, etc., olive-gray. 



Geothlypis rostrata, adult female (p. 675) 

 ii. Throat and chest bright yellow; back, etc., grayish olive-greeii. 

 j. Wing and tail longer, bill smaller (wing averaging 61.5, tail 

 56.9, exposed culmen 14.5); upper parts lighter olive-green, 

 the forehead and superciliary stripe grayish, not tinged with 

 yellow. Geothlypis maynardi, adult female (p. 676) 



jj. Wing and tail shorter, bill larger (wing 58.9, tail 55.9, ex- 

 posed culmen 15.2); upper parts darker olive-green, the 

 forehead and superciliary region tinged with yellow. 



Geothlypis tanneri, adult female (p. 676) 

 hh. Under parts entirely yellow; forehead and superciliary region 

 strongly tinged with yellow. 



Geothlypis coryi, adult female (p. 678) 

 ee. Forehead and superciliary region dull yellow, strongly and abruptly con- 

 tracted with olive of crown and occiput; under parts saffron yellow. 

 Geothlypis flaviceps, adult female (p. 681) 

 dd. Sides and flanks deep olive-green, like upper parts. 



Geothlypis semiflava bairdi, adult female (p. 683) 

 cc. Back, etc., brownish olive-green; sides and flanks reddish brown; under 

 parts ochraceous- or fulvous- yellow. 



Geothlypis speciosa, adult female^ (p. 684) 

 bb. Tail decidedly longer than wing. 



Geothlypis nelsoni nelsoni, adult female' (p. 685) 

 Geothlypis nelsoni microrhyncha, adult female.' 



GEOTHLYPIS TRICHAS TRICHAS (Linnseus). 

 MARYLAITD YELLOW-THROAT. 



Adult male in spring mid summer. — Forehead (broadly, or to and 

 sometimes including anterior portion of crown) with loral, orbital, 

 suborbital, malar, and auricular regions uniform black, forming a con- 

 spicuous "mask," this margined posteriorly by a band of light ash gray 

 of variable width, sometimes narrow and abruptly defined posteriorly, 

 sometimes covering whole of crown: rest of upper parts plain dull 

 grayish olive-green, the occiput and hinder part of crown more or less 

 strongly tinged with brown; chin, throat, and chest (sometimes breast 

 also) lemon or canary yellow; under tail-coverts paler yellow; rest of 

 under parts pale buffy or dull buflfy whitish, becoming light buffy 



'Adult females of G. speciosa, G. mlsoni (both subspecies), G. trichas melanops, 

 Cr.flavovelMa, G. incompta, O. exigua, and G. flavida not seen by me. 



