532 NORTH AMERICAN BIRDS. 



b\ Superciliary stripe bright yellow ; top of head with a black stripe on each 



side, and forehead black medially. 



Side of head rich chestnut, becoming blackish on lores ; lower parts 



yellow, changing to olive-green laterally ; length about 5.00, wing 



2.30-2.60, tail 2.40-2.60. Hab. Guatemala and eastern Mexico ; 



southern Texas? 693. B. belli (Giraud). Bell's Warbler. 



b^. Superciliary stripe white ; top of head without any black. 



c^ Lower parts entirely yellow. 



Ear-coverts rufous, like top of head ; length about 4.50-5.00, wing 



2.10-2.20, tail 2.25-2.60. Hab. Central America, from Panama 



to Guatemala. 



B. delatrii Bonap. Delatre's Warbler.^ 



c\ Lower parts yellow only as far back as breast, the belly white and 



flanks and under tail-coverts pale brownish buff. 



Otherwise like B. delatrii, but cheeks more extensively white ; 



length about 4.50-4.75, wing 2.00-2.10, tail 2.20-2.35. Hab. 



Southern Mexico, north to Mirador, Orizaba, and Mazatlan. 



B. rufifrons (Swains.). Rufous-crowned Warbler.^ 



Family MOTACILLIDiE.— The Wagtails and Pipits. (Page 322.) 



Genera. 



a\ Tail equal to or longer than wing ; plumage plain, both above and below. 



b^. Tail longer than wing, double-rounded or emarginate ; hind claw shorter 

 than the toe, strongly curved ; back ash-gray or black. 



Motacilla. (Page 532.) 



b'^. Tail not longer than wing, rounded ; hind claw longer than the toe, slightly 



curved; back olive, olive-green, or brownish.... Budytes. (Page 534.) 



a^ Tail decidedly shorter than wing ; plumage usually much streaked below 



(sometimes above also) Anthus. (Page 535.) 



Genus MOTACILLA Linn^us. (Page 532, pi. CXIX., fig. 1.) 



Species. 



a^. Lower parts pure white; adults with black on chest (throat also, in summer); 

 upper tail-coverts blackish or dark grayish ; third tail-feather black. JVest 

 on ground, usually near water, composed of dried grasses, etc., lined with 

 softer materials. Eggs 3-5, whitish, thickly speckled with brown. (Adults 

 in summer — sexes essentially alike^ : Entire throat and chest uniform deep 



' Basileuterus delatrii BoNAP., Comp. Rend, xxxviii. 1854, 383. 



' Setophaga rufifrons SwAiNS., An. in Menag. 1837, 294. Basileuterus rufifrons Bonap., Consp. i. 1850, 314. 

 ^ Except in M. lugens, in which the female has the back gray or much mixed with gray, instead of uniform 

 black. 



