Knowledge of this bird is as restricted as its habitat. Frazar states that its song is stronger and fuller than the Maryland Yellowthroat's and that it is found among the rushes growing in three feet of water.
NEST: According to Bryant, resembles some Song Sparrows' nests and is thinly lined with fine fibre and horse hair.
EGGS: Usually 4, white with spots and dots of lilac gray with pencilings of black.
Lower California north to San Ignacio and Comondu.
A 25-foot tree, distributed from Cape Sable, Florida, south among the Keys.