BIRDS OF NORTH AND MIDDLE AMERICA. 661 



g(l. Under jiarts^ entirely yellow; lar<,'er (\vin<r and tail more than 55). 

 Geothlypis trichas melanops, adult female (p. 673) 

 ff. T^arger (wing more than 57, exposed culmen not less than 12.9, usually 

 mueh more). 

 (J. Bill smaller (exposed oulmen 12.9-13.7). 



Geothlypis beldingi, adult female (p. 679) 

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



!i. lender parts with more or less of whitish on ahdominal region; fore- 

 head and superciliary region very slightly if at all tinged with 

 yellow. 

 /. Throat and ciiest pale dull yellow, or pale dull Imffy tinged 

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



Geothlypis rostrata, adult female (p. 675) 

 i't. Throat and chest bright yellow; back, etc., grayish olive-green. 

 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. ^Ving and tail shorter, bill larger (wing 5S.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. lender 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 {\^. 681) 

 dd. Sides and flanks deep olive-green, like upjier ]>arts. 



Geothlypis semiflava bairdi, adult female (p. 683) 

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

 parts ochraceous- or fulvous- yellow. 



Geothlypis speciosa, adult female^ (p. 684) 

 hli. Tail decidedly longer than wdng. 



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

 Geothlypis nelsoni microrhyncha, ailult female.' 



GEOTHLYPIS TRICHAS TRICHAS (Linnaeus). 

 MARYLAND YELLOW-THROAT. 



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

 sometimes including- anterior portion of crown) with loral, or])itaI, 

 sul)orbital, 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 abrupt!}' 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 huffy or dull buffy whitish, becoming light bufty 



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

 G. flavorelata, G. incompUt, G. exigua, and G. flavida not seen by me. 



