430 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



i. Middle toe, without claw, decidedly shorter than commissure; 

 basal phalanx of middle toe united for nearly its entire length 

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



black on head , Mioroligea (p. 651) 



a. Middle toe, without claw, equal to or longer than commissure; 

 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) black in adult males. 



Geothlypis (p. 653) 



ee. Tail longer than wing, or else {Granatelhtx, part) bill stout, with culinen 



arched; bill stout, its basal dejitli equal to more than half the distance 



from nostril to tip of maxilla, the culmen strongly convex. (Ickrix.) 



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



toe united for only half its length to outer toe; mandible not deeper 



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



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



times on crown) . 



g. Smaller (wing not more than 63.5) ; tarsus much more than one-third 



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



acuminate or subacuminate at tips; maxillary tomiuni with distinct 



sul iterminal notch Chamsethlypis (p. 686) 



gg. Larger (wing mcjre than 69.8) ; tarsus not more than one-third as long 

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

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

 ff. Outermost (ninth) ]jrimary shorter than third; basal phalanx of mid- 

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

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



upper parts bluish gray or brownish GranateUus (p. 697) 



dd. Eictal bristles conspicuous, half as long as exposed culmen (usually much 

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

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

 [SelophagiF.) 

 e. Outermost (ninth ) i)rimary longer than fifth, the eighth 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 the 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, broader 

 than deep at nostrils; under parts of body yellow, the throat yellow 

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



or gray, like back "Wilsouia (p. 703) 



gg. Tarsus less than one-third as long as tail; bill thicker, deeper than 

 broad at nostrils; under parts of body 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; bill 

 much broader basally (width at nostrils decidedly more than half 

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

 with red or orange, but this not on throat or forehead, 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 sides of breast 

 yellow Setophaga (p. 722) 



