Eristalis abusiva new for valley

With a lack of Eristalis due to the warm weather delaying the main emergence, it is easier to find oddities amongst the low numbers. I've been chasing this species for a few years, they are very nervous and thus hard to photograph, they have a tendency to feed at Upright Hedge Parsley more than other Eristalis. So I located one finally on the road from the cemetery to Cwrtymynys Farm where the green metal fencing and gate area about 30 mts from the car park.

The diagnostic feature which separates abusiva from arbustorum is the mid tibia is all yellow, while in arbustorum the bottom quarter is black. Other features that are helpful but not diagnostic is a thin face stripe (which it had, but not photographed), almost hairless arista on the antennae (which it had) and overall more hairy, which this one looks but that is subjective. ID was later confirmed by R. Morris of the Hoverfly Recording Scheme.

Above is Eristalis abusiva with all yellow mid tibia and below is a typical Eristalis arbustorum , notice the lower darkened mid-tibia.

This is the 9th species of Eristalis recorded in the valley, the only other species not seen is Eristalis cryptarum that breeds in a few valleys in Devon. Formerly common in Glamorgan particularly the coast, has been recorded in 10 - 10km squares as recently as 2012 in the Oxwich area.