Chalkhill Blue (Lysandra coridon (Poda, 1761))

Scientific name: Lysandra coridon (Poda, 1761)
Common name: Chalkhill Blue
Other names: Other scientific name: Polyommatus coridon
French name: Argus bleu-nacré
Order: Lepidoptera
Suborder: Rhopalocera
Family: Lycaenidae
Subfamily: Polyommatinae
Wingspan: 30 to 36 mm.
Biotope: Sunny grasslands up to an altitude of 2500m, with a preference for chalk grasslands.
Geographic area: Europe, missing in south of Spain, south of Italy, north of the British Isles and Scandinavia.
Flight time: July-August.
Number of generations : 1
Caterpillar: Green with lateral and dorsal yellow lines.
Host plant: Horseshoe Vetch (Hippocrepis comosa).

The edges of the Chalkhill Blue's wings show a lightly white and black chequered fringe.
The upperside of the male's wings is a pale silvery blue colour. The outer edge is dark with more or less white-circled black dots, more visible on the hindwings.
The upperside of the female's wings is a dark brown colour with black-centred orange lunules on the hindwings.
The underside of the wings show white-circled black marks. The background colour is grey on the male and brown on the female.


Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
While hiking over 2000 meters in the Alps, I observed numerous Chalkhill Blues landed on the ground with wide open wings.



Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
A higher shutter speed would have made a sharper picture without this light moving blur.



Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
Female. There is a possible confusion with Adonis Blue (Lysandra bellargus).
The identification is based on the chequered fringe and on the fact that I have observed numerous Chalkhill Blue males in the surroundings.



Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
Underside of a male's wings.



Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
Underside of a female's wings.



Chalkhill Blue (Lysandra coridon) - Savoie, France - August 20th 2006
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Chalkhill Blue (Lysandra coridon)
Chalkhill Blues are photogenic butterflies.



Chalkhill Blue (Lysandra coridon) - Yvelines, France - August 31st 2013
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Chalkhill Blue (Lysandra coridon)
You can also observe the Chalkhill Blue in the region near Paris. I have found a small chalky meadow where it flies with Common Blues, Silver-studded Blues and Adonis Blues.



Chalkhill Blue (Lysandra coridon) - Yvelines, France - July 30th 2011
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Chalkhill Blue (Lysandra coridon)
This view is enough to tell that this one is a male and it provides a good view of the pattern on the underside of the wings.



Chalkhill Blue (Lysandra coridon) - Yvelines, France - August 2nd 2011
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Chalkhill Blue (Lysandra coridon)
I think that the brown ground colour indicates one female.

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