300 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
Throat and underparts, dull yellowish green; crown, green, 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 underparts, buffy white; crown and back, olive green; bases of 
primaries, white, forming a small spot on wing (female). 
Black-throated Blue Warbler. 
Dendroica cerulescens. 
See No. 497. 
Throat, gray; belly, white (breast, often washed with yellow); crown, yel- 
lowish green; wing coverts, broadly tipped with yellow (female). 
Golden=winged Warbier. 
Helminthophila chrysoptera. 
See No. 488. 
Group 3. Wing, 2.75 to 3.25 inches long. 
<( as 
491 x 515 \ 
Part 1. The following species have the throat, breast, and belly, yel- 
