FIELD KEY TO COMMON BIRDS. 81 
@. Length 575 inches; a white line over the eye not bordered by 
black ; prefers the upper branches of rows of elns and other shade 
trees; song, a rich, unbroken warble with an alto undertone; May 
to Sept. . . «© © © © © © «© «© Wanetivo Virgo, page 165. 
a. Length 400 inches; no white line over the eye; eye-ring and 
wing-bars white; a tiny, unsuspicious bird; flits about the outer 
branches of trees and shrubs; wings twitched nervously; note, 
cack; song, a remarkably loud, musical whistle; Sept. and Oct.; 
Apland May... . . . Rusy-crownxep Kivocer, page 182, 
6. Back olive-green or dusky olive; flycatchers who capture their prey 
on the wing by darting for it, and while perching are quiet and erect. 
34. Length 7°00 inches; frequently found nesting under bridges or 
about buildings; crown blackish; tail wagged nervously; notes, 
pee, pee, and pewit-phabe; Mch. to Uct. . . . Puase, page 124. 
&. Length 6°50 inches; haunts wooded growths; note, a plaintive 
pee-a-wee; May toSept. . . . . . . Woon Pewee, page 126. 
®. Length 540 inches; haunts orchards, lawns, and open woodlands ; 
note, chebde, chebde . . « « » « Least Frycatousr, page 125. 
¢ Back gray or bluish gray. 
@, Length 6°50 inches ; a gray, crested bird ; forehead black ; no white 
in the tail; note, a whistled peto, peto, or hoarse de-de-de-de; resi- 
dent from New York city southward . . Turrep Trt, page 180. 
@, Length 8°50 inches; a white band at the end of the tail; a con- 
cealed orange-red crest; a bird of the air, catching its insect food 
on the wing, and occasionally sallying forth from its exposed perch 
in pursuit of a passing Crow; note, an unmusical, steely chatter; 
May to Sept. . . . « © + « © «© « « « Kiwosinn, page 122. 
@. Back brown. 
@, Length 5-00 inches; a nervous, restless, excitable bird; tail often 
carried erect ; song sweet, rapid and rippling, delivered with aban- 
don; Apl. 25 to Oct. . . . . . . + « Hovse Wren, page 175. 
@., Length 12-25 inches; slim, brownish birds with long tails; flight 
short and noiseless; perch in a tree, not in an exposed position; 
note, tut-tut, cluck-cluck, and cow-cow; May to Oct. 
Yettow-sittep Cuckoo, Bracksititep Cuckoo, pages 112, 113." 
B. Back brownish, streaked. 
@. Crown rufous or chestnut without streaks. 
@. Length 525 inches; bill black; a whitish line over the eye; a 
familiar bird of lawns and door-yarda; song, a monotonous chippy- 
chippy-chippy. Apl.to Nov. . . Cnirpino Sparrow, page 142. 
@. Length 570 inches; bill reddish brown, back rufous or rufous- 
brown; wing-bars and eye-ring whitish ; haunts dry, bushy fields 
and pastures; song, a musical, plaintive cher-wee, cher-wee, cher- 
wee, cheeo, dee-dee-dee-dee; Apl.to Nov. Frecp Sparrow, page 140. 
@. Length 5-90 inches; forehead black; crown and wings chestnut- 
rufous; flanks pale grayish brown ; haunta marshes ; song, « rapidly 
repeated weet-weet-weet, etc.; Mch. to Nov. 
Swamp Srarnow, page 139, 
