male and female above similar to icarus, but much larger; the underside more prominently spotted, with more numerous ocelli, but the forewing beneath always without basal ocelli; the ground-colour of the underside in the male more shaded with grey and in the female sometimes darkened to a chocolate-brown; moreover, the discal row of ocelli of the hindwing is more proximal, standing nearer the discocellular spot than in icarus.

Southern Europe, from Spain to the Balkan Peninsula, northwards extending into the Alps.

(81 b) is the form from Dalmatia; the male is lighter blue, more similar in colour to hylas than to icarus; the black margin, which is very narrow in escheri is here broader, and the hindwing above bears very weak traces of dark spots at the margin.

— Egg of the usual flattened from, pure white, with small projections at the corners of the meshes of the minute network.

The butterflies commence to fly at the end of June, occurring in mountain valleys, singly but not rarely; they have a rather clumsy flight and frequent specially the beds of brooks.