Documented observation of the White-bellied Hummingbird, Amazilia chionogaster (Tschudi, 1845), in Brazil and the frst record for Rondônia state Luiz Gonzaga Alves Mendonça 1 , Dárius Pukenis Tubelis 2 , Ivinna Kariny da Costa Vieira 2 1 Universidade Estadual de Goiás, Campus de Palmeiras de Goiás, Rua S7 s/n, Setor Sul, Palmeiras de Goiás, Goiás, CEP 76190-000, Brazil. 2 Universidade Federal Rural do Semi-Árido, Centro de Ciências Biológicas e da Saúde, Departamento de Biociências, Av. Francisco Mota no. 572, Mossoró, Rio Grande do Norte, CEP 59625-900, Brazil. Corresponding author: Luiz Gonzaga Alves Mendonça, luiz.mendonca@ueg.br Abstract We report here a documented record of the White-bellied Hummingbird Amazilia chionogaster Tschudi, 1845 for Corumbiara, Rondônia state, western Brazil. This is the fourth locality where this species had been recorded with physical evidence in Brazil. The site of our record is more than 600 km east of the Andean sites where A. chionogaster has been previously recorded. Our record of A. chionogaster is the frst from Rondônia state. This study suggests that this species has an extensive range in South America. Keywords Apodiformes, bird, geographic distribution, Neotropics, range expansion, Trochilidae. Academic Editor: Galo Buitrón-Jurado | Received 30 April 2019 | Accepted 21 September 2019 | Published 11 October 2019 Citation: Mendonça LGA, Tubelis DP, Vieira IKC (2019) Documented observation of the White-bellied Hummingbird, Amazilia chionogaster (Tschudi, 1845), in Brazil and the frst record for Rondônia state. Check List 15 (5): 911–913. https://doi.org/10.15560/15.5.911 Introduction Eighteen species of hummingbirds of the genus Amazilia occur in South America (Remsen et al. 2018). Their upperparts, heads, and breast sides are usually bright green, while their underparts are extensively white or green. Their tails are usually short and slightly forked, and their bills are slightly curved (Del Hoyo et al. 1999; Mata et al. 2006). Of these, eight species have been recorded in Brazil: A. chionogaster (Tschudi, 1845), A. leucogaster (Gmelin, 1788), A. versicolor (Vieillot, 1818), A. rondoniae (Vieillot, 1818), A. brevirostris (Lesson, 1829), A. fmbriata (Gmelin, 1788), A. lactea (Lesson, 1829), and A. viridigaster (Bourcier, 1843) (Piacentini et al. 2015). The White-bellied Hummingbird, A. chionogaster , is known to occur mainly along a continuous and nar- row range in the Andes, including areas in Peru, Bolivia, and Argentina (Mata et al. 2006; Schulenberg 2018). Its range extends eastward to western Brazil, with existing records at Cáceres and Vila Bela de Santíssima Trin- dade, both in Mato Grosso state (Stotz et al. 1996; Sick 1997; Sigrist 2007). At Vila Bela de Santíssima Trindade, three individu- als of A. chionogaster were collected by J. Natterer dur- ing the 1820s, but the species has not been recorded since (Pelzeln 1871; Silveira and D’Horta 2002). The records in Cáceres refer to two birds collected by A. Ruschi in 1955 (Ruschi 1955; Lopes et al. 2016). With just these records, A. chionogaster has been recorded in Brazil Check List 15 (5): 911–913 https://doi.org/10.15560/15.5.911 Copyright Mendonça et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unre- stricted use, distribution, and reproduction in any medium, provided the original author and source are credited. NOTES ON GEOGRAPHIC DISTRIBUTION