Brachyopa scutellaris Robineau-Desvoidy, 1843
Prior to 1939 the only listed British species was B. bicolor. The additional species were not covered by a widely available key until Coe (1953). Consequently, records prior to 1953 must be based on verifiable specimens.
Biology & ecology:
The larva occurs in sap runs or accumulations of sap under bark near the base of trees, including Ash Fraxinus excelsior, Aspen Populus tremula, Yew Taxus baccata and Elm Ulmus sp. Adults are most often found flying around sun-lit bases of trees and can sometimes occur in considerable numbers. It seems as though this species has a relatively short emergence period.
A very widespread species that is primarily found in lowland woodlands. It occurs widely throughout England and Wales and more sporadically in Scotland.
Status & conservation:
There has been a small but significant increase in occurrence in the past 25 years.