[4] Generally pale reddish brown with yellow spots on the indistinctly segmented abdomen.

The characteristic feature of these flies is that they move sidewards and they feed preferably between the hind legs and on the perineum region.

There are occasionally recorded from other part of the UK, though some reports as far north as the Scottish borders are considered dubious.

[6] In the United Kingdom, their flight period is from May to October, but peaking August and early September.

[7] Their primary host are equines; they are often also frequently found on cattle on which they are able to maintain a population.