|Extent of occurrence|
The breeding habitat is in arid scrub of the Sonoran Desert—Chihuahuan Desert ecotone and the Madrean Sky Islands in southeastern Arizona and extreme southwestern New Mexico of the Southwestern United States and northern Sonora of Northwestern Mexico.
Adults are colored predominantly a metallic green on their upperparts and breast. The undertail coverts are predominately white. The tail is darkly colored and slightly forked.
The bill of the male is straight and very slender. It is red in coloration, and shows a black tip. His throat is a deep blue. The female is less colorful than the male. She usually shows a white eye stripe.
The female builds a nest in a protected location in a shrub or tree. Females lay two white eggs. This hummingbird is partially migratory, retreating from northernmost areas during the winter to Central Mexico.