Pysandra coridon (NL: Bleek blauwtje / EN: Chalkhill Blue / DE: Silbergrüner Bläuling / FR: Argus bleu-nacré) is a butterfly in the family Lycaenidae.
It is a locally common species in the limestone areas of Belgium, elsewhere scattered observations of vagrants. Vulnerable. The larva lives on Hippocrepis comosa. The larva is attended by different species of ants.
Males have pale silvery-blue wings with black and white border. Females (see image) are dark brown, also with the black and white borders. As with many blue butterflies, separation from similar species in the field is on the underside markings. The adults fly from the end of June till mid September.
Image: Viroinval (BE) – 11/08/2012
© Johan Dierckx
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