[3] Eublemma ostrinum occurs throughout the Mediterranean including North Africa and is only occasionally found in Central Europe.

Heading east the distribution area is from southern Russia, Asia minor, and Afghanistan.

Occasional finds in northern Europe, such as in 1992 in the UK are usually migrant butterflies, although in 1999. larvae and pupae were found in South Devon and the Isle of Portland.

[3] Forewing cream white, slightly tinged with pale brown in basal half and in terminal area; median shade diffuse, slightly outcurved, followed immediately by a black dot representing the reniform stigma; just beyond it on the costa an oblique purplish bar to vein 6 represents the outer line; submarginal line whitish, sharply indented on each fold and outcurved between, the interval between the two lines filled with purple except at costa beyond median line; the interspaces between the veins often streaked with deeper purple; a purple spot at apex with a blackish speck in it below; a purplish streak from base below cell; terminal line brown inwardly edged with white; fringe white, brownish in middle; hindwing brownish grey, darker along termen; terminal line dark; fringe white; in examples from Algeria and Morocco, besides the purplish tint between the two lines, the whole forewing, except partially along costa, is suffused with olive grey brown, = ab.

nov. [Warren]; —in aestivalis Guen., probably the early summer brood, the purplish tint is restricted to the shade immediately before the submarginal line; the hindwings are paler, in the male almost white, and the examples are smaller in expanse; — in carthami H.