KEY TO BIRDS IN THE FIELD 363 



T. Slender-billed 5 birds. (U.) 

 U. Crown chestnut ; yellow under parts streaked with chestnut on 



breast and sides Palm Warblers, p. 88. 



U. Back olive ; head with a black mask ■ 



Maryland Yellow-Throat, p. 93. 



U. Sides streaked with black ; a white line over the eye ; two white 



wing bars 2 Yellow-throated Warbler, p. 80. 



V. Slender brown bird, with long, sharp-pointed tail feathers" 



Brown Creeper, p. 6.3. 



V. Slender bird, everywhere streaked with black and white 



Black and White Warbler, p. 76. 



V. Short-tailed creeper, with much black and white in the plumage ; 



creeping head downward as often as upward 



White-breasted Nuthatch, p. 59. 



W. Iridescent or glossy-backed swallows. (Z. ) 

 W. Dull-colored birds, without iridescence. (X.) 

 X. Sooty-brown bird, with very short tail, much shorter than the wings 



Chimney Swift, p. 107. 



X. Mouse-colored swallows, with not especially short tails. (Y.) 



Y. Under parts white, with a brownish band across breast 



Bank Swallow, p. 107. 



Y. Throat and breast brownish ; belly white 



Rough-winged Swallow, p. 107. 



Z. Steel-blue-backed swallow, with the throat and breast chestnut ; tail 



deeply forked ' Barn Swallow, p. 106. 



Z. Back steel-blue; rump chestnut; tail nearly even; head, throat, and 



breast chestnut Cliff Swallow, p. 105. 



Z. Elackish-green-backed swallow, with all lower parts white ; tail nearly 

 even Tree Swallow, p. 106. 



Key to Birds between the English Sparrow and Robin in Size 



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



* Creeping birds upon the trunks of trees. (N.) 



* Birds practically always seen on the wing. (M.) 



* Ground birds, with slender bills and plainly spotted breasts. (K.) 



* Decidedly crested, seal-brown birds with yellow tips to the tail feathers 

 Waxwings, p. 103. 



* Not as above. (A.) 



A. With a conspicuous amount of bright yellow or orange in the 

 plumage. (J.) 



