Range. - Mexico, north in summer to the border of Arizona and western New Mexico.

This species is the largest of North American Hummers being 5.25 inches long, this being slightly larger than the preceding. As the name implies, it has a patch of blue on the throat, the upper parts being a uniform greenish; the outer tail feathers are broadly tipped with white. Their nests, which are placed upon the limbs of trees, are made of mosses and plant fibres covered with cobwebs. The two eggs are laid during July and August, and measure .65 x .40.

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