666. Dendroica chrysoparia. 4 3/4 inches.

In some plumages these birds may be confused with the Black-throated Green. Notice that the adult male has a short median line of yellow on the crown, otherwise the top of head and entire back are intense black. Young birds, which bear the closest resemblance to the next species, can be distinguished because their underpays are white, those of the Black-throated Green being tinged with yellow.

These rare Warblers have a very restricted distribution, but are said to be not uncommon within their range.

Notes. - Song with the usual Warbler quality, but entirely distinctive: "sweah-sweah-swee-e-e."

Nest. - Of strips of bark, usually located in juniper trees six to twenty feet above ground. Eggs white, splashed about the large end with reddish brown (.65 x .50).

Range. - Central Texas southward into Mexico.