Ábrahám Levente – Farkas Sándor: Butterflies along the river Drava, 2008

The only way to identify many of the butterflies is to look at the underside of the wings, because the upper side is very similar in the case of related species. The brown hmsireak (Thedabetulae) [32] wears two tiny tails on its hindwings, and the rusty brown underside is marked with thin silver lineation. The small pearl-bordered fritillary (Clossiana selentj [33] is a colourful species, with silvery shine appearing on the pointed markings in the outer margin of the hindwings. On the greenish underside of the hindwings of the dark green fritillary (Mesoacidalia aglaja) [34], there are oval silver spots. All three species have sporadic distribution along Drava river.