WOOD WARBLERS 431 



there are in a flock of Warblers! Who can say what rare species may be 

 among them? perhaps the bird we have long vainly looked for; per- 

 haps a stranger from another clime! 



1907. CHAPMAN, F. M., and others. The Warblers of North America, 

 8vo., col. plls. 24; pp. 306 (Appleton). 



KEY TO THE SPECIES 



First Group. Throat yellow, yellowish, or orange. 



I. Underparts without streaks or spots. 



II. With black or brown streaks on the breast or sides, or (in one species) a 

 blackish brown band across the throat, or (in one species) a black 

 patch on the breast. 



Second Group. Throat black, gray, ashy, white, whitish, brown, 

 or bun*y. 



I. Throat and upper breast one color, black, gray, ashy, or brown, very 



different from the white or yellow belly. 

 II. Throat white or whitish, with or without streaks or spots; rest of under- 



parts streaked or spotted with black, bluish, chestnut, or yellow. 

 III. Underparts white, whitish, or buffy, without streaks, spots, or patches. 



FIRST GROUP 

 I. Underparts without streaks or spots. 



1. Tail with conspicuous white spots or patches. 



A. Wings with white wing-bars. 



a. Underparts entirely pure yellow. 



a 1 . Forehead yellow; a black line through the eye; rump same as 



back 641. BLUE-WINGED WARBLER. 



a 2 . Crown ashy; rump yellow . 657. MAGNOLIA WARBLER (Im.). 



b. Underparts not entirely pure yellow. 



b 1 . Throat bright yellow; belly white or whitish. 



b 2 . Back olive-greenish 671. PINE WARBLER. 



b 3 . Back bluish, with a yellowish patch in the middle. 



648. PARULA WARBLER (Im.). 

 c 1 . Underparts pale yellowish white or buffy; throat not brighter 



than belly. 

 c 2 . Back olive-green, slightly streaked with black. 



c 3 . Underparts pale cream-buff, stronger on the flanks. 



660. BAY-BREASTED WARBLER (Im.). 

 c 4 . Underparts pale yellowish white. 



661. BLACK-POLL WARBLER (Im.). 

 d 2 . Back not streaked. 



d 3 . Back olive-green, without streaks . 671. PINE WARBLER 9. 

 d 4 . Bak with a bluish tinge and without streaks. 



658. CERULEAN WARBLER (Im.). 



B. Without white wing-bars. 



o. Underparts bright orange or orange-yellow; wings, tail-coverts, 

 and tail bluish gray .... 637. PROTHONOTARY WARBLER. 



b. Underparts pure yellow; wings, rump, and tail greenish; head 



sometimes blackish; inner web of outer tail-feathers white. 



684. HOODED WARBLER (9 and im.). 



c. Underparts pale yellowish; head ashy; rump olive-green; small 



white tail-spots, not reaching to ends of feathers. 



640. BACHMAN'S WARBLER (9 and im.). 



d. Underparts pale yellowish; entire upperparts olive-green; a 



white spot at the base of the primaries. 



654. BLACK-THROATED BLUE WARBLER 9. 



