Blues

A guide to butterfly species commonly found in Dorset

Adonis Blue

Lysandra bellargus

Adonis Blue
When to see:

1st Brood: Early May to Mid July
Peak: Early to Mid June
2nd Brood: Early August to End September.
Peak: Mid August to Mid September

Habitat:

Sheep-grazed calcareous downland

Where to see:

Clubmens Down, Fontmell Down, Ballard Down, Durlston CP West, Cerne Abbas, Melbury Hill

Foodplants:

Horse-shoe Vetch (short)

Behaviour:

Patrol

Atlas: Distribution map & population trends

 

Brown Argus

Aricia agestis

Brown Argus
When to see:

1st brood: End April - Beginning July
Peak: End May
2nd brood: End July - End September
Peak: End August

Habitat:

Mainly Downland, some Woodland

Where to see:

Fontmell Down, Hod Hill, Ballard Down, Durlston CP East, Durlston CP West, Townsend Quarry, Cerne Abbas, Avon Heath CP North, Avon CP South, Badbury Rings, Stour Valley

Foodplants:

Rock Rose, Storksbill

Behaviour:

Perch/Patrol

Atlas: Distribution map & population trends

 

Chalkhill Blue

Lysandra coridon

Chalkhill BlueChalkhill Blue with open wings
When to see:

July to End September.
Peak: Mid July to End of August

Habitat:

Chalk/limestone downland

Where to see:

Cashmoor, Clubmens Down, Fontmell Down, Hod Hill, Cerne Abbas, Portland Tout, Badbury Rings, Bindon Hill

Foodplants:

Horseshoe Vetch (tall)

Behaviour:

Patrol

Atlas: Distribution map & population trends

 

Common Blue

Polyommatus icarus

Common Blue
When to see:

Mid May to Early July. Mid July to Mid September. End September to End October.
Peak: June and August to Mid September.

Habitat:

Downland, open rough ground

Where to see:

Cashmoor, Clubmens Down, Fontmell Down, Girdlers Coppice, Lydlinch Common, Melbury Down, Sovell Down, Ballard Down, Durlston CP East, Durlston CP West, Townsend Quarry, Cerne Abbas, Kingcombe Pound, Kingcombe Redholm, Portland Broadcroft, Portland Tout, Powerstock North, Powerstock Railway, Avon Heath CP South, Badbury Rings, Ham Common

Foodplants:

Birdsfoot Trefoil, Restharrow

Behaviour:

Perch/Patrol

Atlas: Distribution map & population trends

 

Holly Blue

Celastrina argiolus

Holly Blue
When to see:

1st Brood: End March to Early June.2nd Brood: July to Mid September

Habitat:

Lanes, rides, anywhere

Where to see:

Cashmoor, Clubmens Down, Piddles Wood, Ballard Down, Durlston CP East, Townsend Quarry, Ham Common, Kinson Common, Stour Valley

Foodplants:

First brood: Holly. Second brood: Ivy

Behaviour:

Patrol

Atlas: Distribution map & population trends

 

Silver-studded Blue

Plebejus argus

Silver-studded BlueSilver-studded Blue from the side, showing the silver studs
When to see:

End June to End August.
Peak: July

Habitat:

Heathland rides/firebreaks or limestone grassland (calcareous)

Where to see:

Higher Hyde, Studland, Tadnoll, Portland Broadcroft, Portland Tout, Avon Heath Country Park, Sopley Common, Slop Bog

Foodplants:

Heathers (mainly Erica tetralix), Gorse, Birdsfoot Trefoil

Behaviour:

Patrol

Atlas: Distribution map & population trends

 

Small Blue

Cupido minimus

Small BlueSmall Blue on a leaf

A very small butterfly, as can be seen from the photo on the right.

When to see:

Early May to End June. Mid to End August.
Peak: Late May to Late June

Habitat:

Downland, short turf calcareous areas

Where to see:

Cashmoor, Clubmens Down, Durlston CP West, Portland Broadcroft, Bindon Hill

Foodplants:

Kidney Vetch

Behaviour:

Aggressive/Perch

Atlas: Distribution map & population trends