2, see text Chionomesa is a genus of South American hummingbirds in the family Trochilidae.

A molecular phylogenetic study published in 2014 found that Amazilia was polyphyletic.

[2] In the revised classification to create monophyletic genera, these species were moved to the resurrected genus Chionomesa that had been introduced in 1921 by the French naturalist Eugène Simon.

[1][3][4] The genus name combines the Ancient Greek khiōn meaning "snow" with mesos meaning "middle".

[5] The type species was designated as the sapphire-spangled emerald by the American ornithologist Charles Wallace Richmond in 1927.