An American species that has been introduced elsewhere along with its host plant, trees of the genus Platanus. These trees are very popular ornamental trees in cities, and a number of heteropteran species have been introduced to Europe along with them in the past decades. Belonochilus numenius has been reported in Europe from Palma de Mallorca in 2008, and has since been recorded from a number of European countries including Spain, France, Monaco, Italy, Austria, Slovakia, Czech Republic, Hungary, and Switzerland; there is also a record from the Azores (Werner 2014). The first record of the present species in Germany (from Baden-Württemberg) has been published by Werner et al. 2013. Werner (2014) lists 4 records from different localities in Baden-Württemberg (all from 2012). The species is also known from Bayern (Bräu 2014) and Nordrhein-Westfalen (Hörren and Bodingbauer 2020b).