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 buffy. 
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}, Forehead yellow; a black line through the eye; rump same as 
back . . . . . . . . 641. BLUE-wINGED WARBLER. 
a’, Crown ashy; rump yellow . 657. Maanoxtia WARBLER (Im.). 
b. Underparts not entirely pure yellow. 
bl. Throat bright yellow; belly white or whitish. 
b?. Back olive-greenish . . . . . . 671. Prine WaRBLER. 
b3, Back bluish, with a yellowish patch in the middle. 
648. ParuLa WARBLER (Im.). 
c!. Underparts pale yellowish white or buffy; throat not brighter 
than belly. 
ce. Back olive-green, slightly streaked with black. 
c3}. Underparts pale cream-buff, stronger on the flanks. 
60. BAaY-BREASTED WARBLER (Im.). 
c’. Underparts pale yellowish white. 
661. BLAcK-POLL WARBLER (Im.). 
d@. Back not streaked. 
d@, Back olive-green, without streaks . 671. Prins WARBLER 9. 
d‘. Back with a bluish tinge and without streaks. 
658. CERULEAN WARBLER (Im.). 
B. Without white wing-bars. : 
a. Underparts bright orange or orange-yellow; wings, tail-coverts, 
and tail bluish gray . . . . 637. PRorHonoTtary WARBLER. 
b. Underparts pure yellow; wings, rump, and tail greenish; head 
sometimes blackish; inner web of outer tail-feathers white. 
684. Hooprp WARBLER (9 and im.). 
c. Underparts pale yellowish; head ashy; rump olive-green; small 
white tail-spots, not reaching to ends of feathers. 
640. BacuMAN’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°, 
