. . . . . . . . . "Bombus sonorus" . . "Peritoma arborea" . . "Valtierra. 2018. Bombus sonorus associated species with names lookup Peritoma arborea. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/10093006> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .