Azorean Bombus species: a Bombus ruderatus queen, UK b Bombus terrestris queen, July 2016, Terceira; c) Bombus ruderatus worker on Ballota nigra (Lamiaceae), July 2016, Terceira (Angra do Heroísmo) d Bombus terrestris worker on Azorina vidalii (Campanulaceae), July 2015, Corvo e Bombus ruderatus male on Lantana camara (Verbenaceae), September 2010, São Miguel f Bombus terrestris male, July 2016, Flores g Bombus pratorum male on Prunella vulgaris (Lamiaceae), August 2015, Faial (Miradoura da Caldeira) h Bombus pratorum worker, Norway; photos: Steven Falk (a), Hanno Schaefer (b, c, e, f), Julie A. Weissmann (d), Valter Jacinto (g) and Kjetil Fellheim on wikipedia (creative commons license) (h); scale bars 2 mm.