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. Had. Guatemala and eastern Mexico ; 
southern Texas?......+...- 693. B. belli (Ginaup). 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. delattrii Bonar. Delattre’s Warbler.! 
@. 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.’ 
Famity MOTACILLIDZE.—Tue Wacrtaits anv 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 shortet 
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 al80)........ceceeeeeneeeee ccetseneeeeeeenees Anthus. (Page 535.) 
Gents MOTACILLA Linnazug, (Page 532, pl. 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. Nest 
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 
1 Basileuterus delatrii Bonap., Comp. Rend. xxxviii. 1854, 383. 
2 Setophaga rufifrons Swatns., An. in Menag. 1837, 294, Basileuterus rufifrons Bonap., Consp. i. 1850, 314. 
3 Except in M. lugens, in which the female has the back gray or much mixed with gray, instead of uniform 
block. 
