BIRDS OF NORTH AND MIDDLE AMERICA. 431 



et'. Onteniiost (ninth) primary sliorter than tifth, the eighlli s^liorler than 



sixth. 



/. Bill larger, broader at base (wider than deep at nontrils), its width at 



nostrils eqnal to at least half the distance from nostril to tip of 



maxilla; if small and relatively narrow the plumage without any red. 



'/. Bill mueh depressed, broadly wedge-shaped or triangular in vertical 



profile, its width at base nearly if not (]uite equal to distance from 



nostril to tip of maxilla, the exposed culmen much less than half 



as long as tarsus; rictal bristles greatly developed, nearly if not 



quite as long as bill; lateral rectrices mostly white, or if less than 



half white the under parts of Ix^ly red or orange; pileum not 



striped, nor upper tail-coverts nor basal half of tail buffy or 



ochraceous Myioborus (p. 730 ) 



gtj. Bill moderately or slightly depressed, more narrowly wedge-shaped 

 in vertical profile, its width at base much less than distance from 

 nostril to tip of maxilla or else exposed culmen more than half 

 as long as tarsus; rictal bristles less developed, much shorter tlian 

 bill; lateral rectrices without any white, or else with merely a 

 white terminal spot; pileum 3-striped, or black with a central 

 spot of yellow, or else upper tail-coverts and basal half of tail 

 Ijuffy or ochraceous. 

 /(. Larger (wing more than 72.4); lateral rectrices with a white ter- 

 minal spot; pileum black with a central spot of yellow. 



Euthlypis (p. 735) 



hli. .Smaller (wing not more than 72.4, usually nuich less); lateral 



rectrices without any white; pileum not black with a central 



yellow spot, but 3-striped, or else uniform dark olive-brown 



and the upper tail-coverts and basal half of tail buffy or 



ochraceous Basileuterus (p. 73S) 



ff. Bill smaller, narrower at base (deeper than wide at nostrils), its width 

 at nostrils less than half the distance fi'om nostril to tip of maxilla; 



plumage mostly red Ergaticus (p. 758) 



lili. Tarsus more than half as long as tail, more than twice as long as middle toe 



without claw. ( Ccrthideina\ ) Certhidea (p. 701 ) 



aa. Outermost (ninth) ]>rimary conspicuously shorter than secondaries; eighth pri- 

 mary shorter than first; nostril circular, without distinct superior opercu- 

 lum. ( R]iod'tnocic}diniv. ) Rhodinocichla {p. 769 ) 



Genus MNIOTILTA Vieillot. 



Mniotllta Vieillot, Analyse, 1816, 45. (Type, Motacilla varia Linna?us. ) 

 Oxi/glunsus SwAiNsoN, Zool. Journ., iii, 1827, 357. (Type, 0. niaculalufi Swainson, = 

 Motacilla varia Liniueus. ) 



Small .sc-ansorial Mniotiltidiu with the halhix (without claw) lonoer 

 than inner toe with claw. 



Bill .shorter than head, very slender, the maxilla f^lig"hty deciirved 

 terminally and with distinct subterminal tomial notch. Rictal bristles 

 minute, weak. Wing- lon<^, pointed (ninth, eiohth, and seventh prima- 

 ries longest and about e({ual); wing'-tip equal to or longer than tarsus. 

 Tail slightly shorter than distance from bend of wing- to tips of sec- 

 ondaries, even or very slightly emarginate, the rectrices rather narrow. 

 Tarsus about one-fourth as long as wing or slightly less, its scutella 



