Flower flies (Diptera: Syrphidae) are a ubiquitous family of true flies known for their hovering mating displays and pollinating behaviour. The flower fly genus Pterallastes Loew is represented by Pterallastes thoracicus Loew in North America, and its previously published range encompasses only the United States of America. Here, we report two new records for Canada and a previously overlooked historical record for the country. These data were used to generate an updated range map for the species, with additional iNaturalist records further expanding its known distribution in the United States of America. Finally, flower associations and natural history data for the species gathered from iNaturalist photos are discussed briefly.

Canadian entomology collections contain valuable biodiversity and ecological data. To be most accessible to those working outside of the collections, they need to be digitised. Multiple analyses of the digital database of the Odonata collection at the Royal British Columbia Museum (Victoria, British Columbia, Canada) were conducted. These analyses reveal that complete digital datasets can be used to explore questions of historical and current geographical distribution and species composition differences based on ecoprovince and elevation. The results of these analyses can be used directly in conservation and climate change impact mitigation decisions. These analyses are possible only because the Odonata collection has received concerted effort to digitise all specimen records. The full value of long-term historical insect biodiversity data can be accessed only once collections are digitised. Additional training and employment of collection management and curatorial staff is essential to optimise the use of abundant but underused Canadian biodiversity data.