The false dewy ringlet (Erebia sthennyo) is a member of the Satyrinae subfamily of Nymphalidae. It is found in the Pyrenees in Spain and France. In Spain it is found in the central Pyrenees in Puerto de Portalet, Monte Perdido and Puerto de Benasque, in France it is found from Pic du Midi d'Ossau to Pic du Midi de Bigorre and Luchon, as well as from Port de Salau to Andorra. It is found on heights from 1,800 meters upwards.
The wingspan is 40–44 mm. Adults are on wing from the end of June to the beginning of August in one generation.
The larvae feed on various grasses.
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