Eristalis rupium Fabricius, 1805
Biology & ecology:
The larva is of the ?long-tailed? type and is apparently found in clean-water situations, such as spring-fed permanent streams. Adults are usually found in fairly open situations such as wet meadows and streamsides with abundant flowers, often in the uplands (to about 300m). They can sometimes be found in glades in conifer plantations where flowers are abundant.
This is a northern and western species which can be very local, even in apparently suitable areas. Care is needed in identification as it can be confused with E. horticola.
Status & conservation:
There has been a substantial decline in occurrence over the past 35 years, especially to 2000 with little change thereafter. This seems to be particularly evident in the more southern parts of its range in Wales and northern England.