Callopistria juventina
The Latin "(Callopistria juventina)" is a moth of the family Noctuidae. The species is found across the Palearctic realm. Technical description and variation. "E. juventina" Cram. (= "purpureofasciata" Piller, "lagopus" Esp., "pteridis" F., "formosissimalis" Hbn.) (44 d). Forewing olive brown, shaded in parts with black; the veins pale, towards termen rosy and cream coloured; inner and outer lines double, finely black, filled in with rosy and followed by rosy bands, that beyond outer line broad [en] ; both lines commence on costa as white oblique strigae before the subcostal angulation; stigmata olive brown tinged with rosy, their annuli white , more prominent in the reniform, and forming a sort of hook at lower extremity externally; sometimes a rosy streak on submedian fold beyond the very obscure claviform; subterminal line yellowish white, forming oblique streaks above veins 6 and 7, followed by a pale apical patch, angled inwards above 5 and acutely outwards at 4, thence obscure; a lunulate yellowish white line before termen; the terminal area rosy; fringe chequered, ochreous and dark olive brown; hindwing ochreous suffused with pale fuscous, with broad dark terminal border, an outer line and cell spot; the Japanese form "obscura" Btlr. (44 d) is duller , all the rosy tints being greatly reduced in extent and brilliancy. Larva green, with whitish or yellowish oblique lunular subdorsal markings, lateral line yellowish white; all the yellowish markings sometimes edged with pink; head reddish. The wingspan is 34–38 mm. Biology. The moths flies from June to July depending on the location. The caterpillars feed on "Pteridium aquilinum".