99 



30. Crown olive-yellow; sides of head, throat and chest white, sides 



chestnut Chestnut-sided Warbler. 



30. Crown chestnut; sides of head black; throat, chest, and sides 



chestnut Bay-breasted Warbler. 



30. Crown black, no chestnut, but wholly black and white. . . . 



Black-poll Warbler. 



31. Back streaked with black; a white eye-ring; below pale yellow, sides 



streaked Kirtland Warbler. 



31. Back not streaked with black; no eye-ring (32) 



32. A distinct yellowish wing-band; crown unstreaked olive, below 



yellow Prairie Warbler. 



32. No wing-band; crown chestnut in adult, streaked grayish in young 



Palm Warbler. 



33. Above greenish yellow ; below bright yellow, streaked with chestnut in 



male Yellow Warbler. 



33. If bright yellow below, not streaked, and sides of head with blackish(34) 



34. Under parts distinctly spotted (35) — not spotted (37) 



35. Crown rufous, bordered by black; a white eye-ring but no dusky streak 



behind the eye Ovenbird. 



35. Crown plain olivaceous; no eye-ring, but with a dusky streak behind the 



eye (36) 



36. Line over eye narrow, yellowish; under tail-coverts yellowish ; 

 under parts, including throat, heavily streaked with blackish on 



a yellowish ground Grinnell Water-thrush. 



36. Line over eye broad, white; under tail-coverts buffy; under parts, 

 excluding throat, lightly streaked with brownish on a, buffy 



ground Louisiana Water-thrush. 



37. Throat and chest bright yellow; sides of head with black (38) 



37. Throat and chest bluish gray to blackish (male) or brownish to grayish 



(female) (40) 



38. A yellow line over eye; whole crown black or grayish black 



Kentucky Warbler. 



38. No yellow line over eye ; only forehead black (39) ' 



39. Space behind black on forehead of male pale gray; yellow of under parts 



duller; female darker above Smaller, tail under 2 inches 



Northern Yellowthroa. 



39. Space behind black on forehead of male white; yellow of under parts 

 much brighter, more orange; female paler above. Larger, tail over 



2 inches.' Western Yellowthroat. 



40.' Tail nearly even; breast without black, a decided white eye-ring 



Connecticut Warbler. 



40. Tail rounded; breast with black; no decided eye-ring, at most 



eyelids white « (41) 



41. No white on eyelids; tail under 2 inches; chest blacker, lores less so in 



male. . ' * . . . Mourning Warbler. 



41. A white mark on each eyelid; tail over 2 inches, chest less black, lores 

 more so ." Macgillivray Warbler. 



