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Euchloe ausonia, the eastern dappled white, is a southern European and Palearctic butterfly found mostly to the south and east of its almost indistinguishable relative the western dappled white.
The wingspan is 36–48 mm. The forewings are white with black tips and a black spot. The underside is characterized by black and yellow scales, which create a greenish-white pattern. The female is generally darker. The two generations differ in pattern. The colour of the caterpillar varies from yellowish to greenish to bluish. It has obvious side stripes. The dorsal line and the dorsal side line are darker than the base colour. The segments have numerous, very small, black dots. The pupa is light brown and relatively slim.
Euchloe ausonia occurs in Europe in central and southern Italy as well as in the Balkan Peninsula including most of the larger, Greek islands. The northern border in Europe runs through southern Austria, Hungary and southern Ukraine. In the east, the presence in the south continues to Israel and Jordan and in the east to northern Iraq, Iran and Afghanistan, to the north via the Caucasus up to southern Kazakhstan and across the Palearctic to Tian Shan, Altai and Tibet. The species prefers rocky slopes, rocky meadows, abandoned or neglected cultivated land, open olive groves, roadsides, mountain meadows and also forest edges up to 2000 m above sea level. In the habitat nectar plants, particularly cruciferous must be common as well as, of course, the caterpillar food plants.
