The Chalkhill Blue butterfly is identified by the dark veins crossing the white fringe of the upperside of the wings. The male is blue on the upperside but a slightly paler, chalkier blue than the Common Blue; the female is brown.
Seen in my Wiltshire garden: 3 August 1999 - very rare garden visitor
garden plants that attract this species: Hyssop
I decided that I really wanted to see and photograph a Chalkhill Blue this year, so went out looking for one.
Chalkhill Blue butterflies are fairly common on the limestone grassland of the Cotswold hills. Cirencester is a small market town on the edge of the Cotswolds. I don't expect to see Chalkhill Blue butterflies in my garden though as I doubt that there's a nearby colony.
Size: 38mm (smaller than the Small White - see list of butterflies by size)
First Generation flight period: July-September
Habitat: chalk or limestone grassland
Larval Food Plants: Vetches, Bird's Foot Trefoil
Wild Nectar Plants: Knapweed
Family Group: Lycaenidae - see list of butterflies by family