430 BULLETIN lO, UNITED STATES NATIONAL MUSEUM. 



/. .Middle toe, without claw, decidedly shorter than conimissiire; 

 liasal j)halanx of middle toe united for nearly its entire lennjth 

 to outer toe; under parts gray, becoming wiiitish medially; no 



1 )lack on liead Microligea ( [>. tio ! ) 



//. iSIiddle toe, without claw, equal to or longer than c(jmmis:sure; 

 basal phalanx of middle toe united for much less than its 

 entire length to outer toe; under parts yellow; forehead and 

 sides of head (at least partly) Idack in achilt males. 



Geothlypis (p. ()53) 

 ee. Tail longer than wing, or else {(Iriiuatclhix, part) bill stout, with culmen 

 arched; bill stout, its basal depth e(iual to more than half the distance 

 from nostril to tip of maxilla, the I'ulmen strongly convex. {IeUrI;v.) 

 f. Outermost (ninth) primary longer than third; basal phalanx of middle 

 tiic luiitcil for only half its length to outer toe; mandilile not deeper 

 than ma.xilla; under parts partly yellow, without any red; u])per 

 parts olive-greenisli, without pure gray or bluish gray (except some- 

 times on crown). 

 g. Smaller (wing not more than 63.5) ; tarsus much more than onc-tiiird 

 as long as wing; tail nuich rounded or graduated, with rectrices 

 acuminateor subacuminate at tips; maxillary tomium with distinct 



sul)terminal notch Chamaethlypis (p. (iSI)) 



gg. Larger ( wing more than 69.8) ; tarsusnotmore than one-third as long 

 as wing; tail slightly roumled, with rectrices obtuse or rounded at 

 tips; maxillary tomium without subterminal notcli. .Icteria (p. 691 ) 

 ff. Outermost (ninth) primary shorter than third; basal i)halanx of mid- 

 dle toe united fpr nearly its entire length to outer toe; mandible 

 deeper than maxilla; under parts partly red, without any yellow; 



upper parts bluish gray or l)rownish Granatellus (p. 697) 



dd. Kictal l)ristles conspicuous, half as long as exposed culmen (usually mucli 

 more); bill dei)ressed, its basal width exceeding its basal depth, or else 

 very short (exposed culmen not longer than middle toe without claw). 

 (Set(ip]iag:i-.) 

 e. ( )utermost (nintli) 2)rimary longer tlian fifth, the eiglith equal to or longer 

 than sixth. 

 /. Wing less than four times as long as tarsus; tail even or slightly emar- 

 ginate or double-rounded; bill much narrower basally (width at nos- 

 trils not more than half tlie distance from nostril to tip of maxilla), 

 less depressed ; plumage without red or orange, or else this only on 

 forehead, throat, and sides of neck; under parts of body wholly white 

 or yellow. 

 g. Tarsus more than one-third as long as tail; bill more slender, l)roa<ler 

 than deep at nostrils; under i)arts of body yellow, the throat yellow 

 or black, the forehead yellow, olive-green, or gray; rump olive-green 



or gray, like back Wilsonia (p. 10'6) 



gg. Tarsus less than one-third as long as tail; l)ill thicker, deeper than 

 broad at nostrils; under parts of l)ody white, the throat and fore- 

 head red; rump white ' Cardellina (p. 719) 



ff. Wing more than four times as long as tarsus; tail much rounded; l>ill 

 nmch broader ])asally (width at nostrils decidedly more than half 

 the distance from nostril to tip of maxilla), more depressed; plumage 

 with red or orange, l)ut this not on throat or forehi'ad, or if without, 

 the lateral rectrices with basal half pale yellow; under parts black, 

 with red on middle of breast or with orange on sides of breast and 

 the belly white; or if without black on under parts the sidesof l^reast 

 yellow Setophaga (p. 722) 



