366 THE STUDY OF BIBD8 IN THE FIELD 



L. Whole back from crown to tip of tail reddisli ; upper breast slightly 



spotted ; sides white Wilson's Thrush, p. 52. 



L. Whole back olive 



Olive-backed Thrush, p. 53. Gray-cheeked Thrush, p. 52. 



M. A sooty-black, long-winged, but very short-tailed bird 



Chimney Swift, p. 167. 



M. A swallow with a very deeply forked tail ' and steel-blue upper 



parts ; chestnut on throat and upper breast . . Barn Swallow, p. 106. 



M. All parts more or less shining blue-black. . .Purple Martin, p. 105. 



N. Back black, with a central stripe of white ; wings with round white 



spots ; under parts grayish-white ; some red on the head of the male. 



Hairy Woodpecker, p. 17.3. Downy Woodpecker, p. 173. 



N. Back mottled black, white, and yellowish ; belly greenish-yellow ; 



breast with black ; crown (and in the male throat also) red 



Yellow-bellied Sapsucker, p. 175. 



Key to Birds about the Size of the American Robin 

 The numbers refer to the pages where the birds are described. 



* Creeping birds upon tree trunks. (H.) 



* Peculiarly mottled long-winged brown birds, with large mouth, but short 



bill ; seen mainly on the wing. (D.) 



* Long-winged, fork-tailed,^ slender-billed ^ birds ; seen constantly on 



the wing and appearing like large swallows, but with harsh voices. . . 

 Terns, pp. 323-327. 



* Birds neither fitted for creeping nor seen constantly on the wing. (A.) 

 A. Birds with bright red in conspicuous amounts. (G.) 



A. Grayish-slate-colored bird, with chestnut-brown breast, white throat, 



and white lower belly American Robin, p. 54. 



A. Crested birds, mainly blue in color. (F.) 



A. Black bird, without bright red anywhere, but sometimes with rusty 



tips to the feathers Rusty Blackbird, p. 149. 



A. Slate-colored b ird , with chestnut blotch under the tail. Catbird, p. 65. 



A. Not as above. (B.) 



B. Upper parts uniform in tint, neither streaked nor spotted ; outer tail 



feathers either wholly white or distinctly white at tip ; under parts 



nearly white. (E.) 



B. Slightly crested bird, with grayish to brownish-olive back, grayish 



throat, and sulphur-yellow belly. There are chestnut edgings to wing 



and tail feathers Crested Flycatcher, p. 101. 



B. Upper part gray and brown mottled. (C.) 



