Large Blue
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Glaucopsyhe arion
Extinct as a British Butterfly, but has been reintroduced to Somerset & Gloucestershire.
The Larvae feeds on Wild Thyme, seedheads first, then the ant grubs.
Larger, above of a lighter and more shining blue [than arcas], with a row of black spots across both wings, the spots being sometimes obsolete only on the hindwing of the Male.
At once recognized by the large number of ocelli on the underside, especially on the hindwing, and by the bright blue dusting of the base beneath.
On the wing from the end of June into August.