The goal of this note is to document the presence of B. terrestris on Navarino Island (54°56´S, 67°36´W), Cape Horn Biosphere Reserve, Chile, through captures and multiple sightings. These records are concerning because they represent the southernmost localities for this fast-spreading invasive species in one of the last 24 pristine areas of the world. The first sighting of B. terrestris on Navarino Island occurred in April of 2016, when an individual was observed flying around a shrub of Chiliotrichum diffusum (G.Forst.) Kuntze (Asteraceae). By October of the same year, eight sightings were made and one individual was collected. Later, on a survey through the northern coast of Navarino Island, three individuals were sighted and one of them was captured. Seven individuals were collected in a second survey at the same locations. All captured specimens are workers. Sighting and capture sites are given in figure 1. Specimens were identified following the descriptions of Abrahamovich et al. (2007) and Montalva et al. (2011), and are deposited in the Freshwater Ecology Laboratory Wankara in Puerto Williams, Chile. EXAMINED MATERIAL: All from Chile, Magallanes region, Navarino Island: 1♀ (worker), Puerto Williams (54°56´4.2´´S, 67°36´1.7´´W), 11-10-2016 [11 October 2016], 10 m.a.s.l.; 1♀ (worker), Corrales viejos (54°56’7.93”S, 67°27’57.32”W), 05-02-2017 [5 February 2017], 4 m.a.s.l.; 1♀ (worker), Caleta Eugenia (54°56´1.23”S, 67°19´18.45”W), 21-02-2017 [21 February 2017], 13 m.a.s.l.; 2♀♀ (workers), Km 13 (54°55´40.84”S, 67°25´15.93”W), 22-02-2017 [22 February 2017], 8 m.a.s.l.; 1♀ (worker), Puerto Navarino (54°56´1.23”S, 67°19´18.45”W), 24-02-2017 [24 February 2017], 13 m.a.s.l.; 1♀ (worker), Puerto Toro (55°4´43.57”S, 67°4´37.33”W). 26-02-2017 [26 February 2017], 48 m.a.s.l.; 2♀♀ (workers), Bahía Honda (54°55´13.52”S, 68°13´0.26”W), 11-03-2017 [11 March 2017], 2 m.a.s.l., J. Rendoll leg.

Published as part of Cárcamo, Javier Rendoll, Contador, Tamara, Saavedra, Lorena & Montalva, José, 2017, First record of the invasive bumble bee Bombus terrestris (Hymenoptera: Apidae) on Navarino Island, southern Chile (55 ° S), pp. 1-5 in Journal of Melittology 2017 (71) on page 2, DOI: 10.17161/jom.v0i71.6520, http://zenodo.org/record/13228942