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Brown Argus

Brown Argus ©Amy Lewis

Brown argus

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The Brown argus favours open, chalk and limestone grasslands, but can also be spotted on coastal dunes, in woodland clearings and along disused railways.

Scientific name

Aricia agestis

When to see

May to September

Top facts

Stats

Wingspan: 2.5-3.1cm
Common.

About

The Brown argus is a small butterfly that is on the wing throughout the summer, between May and September. Adults feed on Common Rock-rose, which is also the caterpillars' foodplant, together with various species like Crane's-bills. The Brown argus is found in dry, sunny and open habitats, including heathland and downland, and seems to be expanding its range as the climate warms up.

What to look for

The Brown argus has bronzy-brown upperwings with an orange band of spots across the edge of each wing. It is very similar to the female Common Blue, but tends to be smaller, with no hint of blue in the wings.

Where to find

Found across southern and central England and parts of the Welsh coast.

Did you know?

A very close relative, the Northern Brown argus, is found in northern England and Scotland and is a Priority species under the UK Post-2010 Biodiversity Framework. The Northern Brown Argus does not usually have very prominent orange spots on the forewing.