This Horsefly crawled between two panes and expired so I've collected and pinned it. What key features can I look at that separate this from others of its family?
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A side view of the antennae would show whether there is a notch towards the upper end of the shiny 1st antennal segment, as in pluvialis. The palps are quite dark haired compared to crassicornis, too. crassicornis is also darker, this one looks rather dull like pluvialis. There are others, but they are mainly more coastal levels species.
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Lat/Lng: 51.7597, -0.1757
OS grid ref: TL260083