Range. - Mexican boundary from western Texas to southern California.

This species has a bright shining black crown and more black on the tail than the eastern Gnatcatcher. They saddle their nests upon the branches of trees or in upright forks, usually at an elevation of ten feet or more from the ground; the nests are made of plant fibres and fine bark strips, compactly felted together, and with little, if any, ornamental lichens on the exterior. Their eggs are pale greenish blue, spotted with reddish brown, and vary from three to five in number. Size .54 x .44.

Bluish white.

Greenish blue.