.j82 blue yellow-back WARBLER. 
the inner webs of the three exterior feathers with white, a cir- 
cumstance common to a great number of the genus; immediately 
above and below the eye is a small touch of white; the upper 
mandible is black, the lower, as well as the whole throat and 
breast, rich yellow, deepening about its middle to orange red, 
and marked on the throat with a small crescent of black; on the 
edge of the breast is a slight touch of rufous; belly and vent 
white; legs dark brown; feet dirty yellow. The female wants 
both the black and orange on the throat and breast; the blue on 
the upper parts is also of a duller tint. 
