In accord with AOS-SACC (Proposals 780 and 781) and AOS-NACC (Chesser et al. 2020b), the sequence of hummingbirds in the group previously listed between Chlorostilbon and Hylocharis is revised, based primarily on McGuire et al. (2014) and Hernández-Baños et al. (2020). In accord with AOS-SACC (Proposals 781 and 877), change the scientific name of White-bellied Hummingbird from Amazilia chionogaster to Elliotomyia chionogaster (Stiles et al. 2017a, b), based on genetic evidence that the traditional genus Amazilia is not monophyletic (McGuire et al. 2014). Elliotomyia Stiles and Remsen 2019 is a recently described genus (Stiles and Remsen 2019).