Plebejus pylaon

Plebejus pylaon, the zephyr blue, is a butterfly in the family Lycaenidae. It is found from Spain, across southern Europe, Hungary, the Balkans, southern Russia and the Middle East to Iran. The habitat consists of dry habitats, Sudan savanna and the Sahel.

The wingspan is 28–34 mm. Adults are on wing from May to July.

The larvae feed on Astragalus species, including Astragalus exscapus, Astragalus dasyanthus, Astragalus parnassi cyllenus, Astragalus angustifolius and Astragalus creticus rumelicus. They are attended by ants of the Bothriomyrmex, Tapinoma, Lasius, Camponotus, Tetramorium and Formica genera.