300 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Throat and underpants, dull yellowish green ; crown, greeu, with partly 

 concealed orange brown patch in centre (wanting in young birds) ; outer 

 tail feathers, narrowly edged with white on inner web ; rest of tail 

 feathers, without white; no white spot at base of primaries. 



Orange-crowned Warbler. 



Helminthophila celata. 

 See No. 492. 



Throat and underpants, buffy white ; crown and back, olive green ; bases of 

 primaries, white, forming a small spot on wing (female). 



Black-throated Blue Warbler. 



Dendroica casrulescens. 

 See No. 497. 



Throat, gray; belly, white (breast, often washed with yellow); crown, yel- 

 lowish greeu ; wing coverts, broadly tipped with yellow (female). 



Golden-winged Warbler. 



Helminthophila chrysoptera . 

 See No. 488. 



Group 3. Wing, 2.75 to 3.25 inches long. 



498 



615 \ 



Part 1. The following species have the throat, breast, and belly, yel- 



