Ichneutica virescens, also known as the greater alpine grey,[3] is a moth of the family Noctuidae.

The adults are similar to I. panda, I. falsidica and I. nobilia, but is distinguished by size, wing colouration, and antennae formation.

[5][2] J. S. Dugdale, in his catalogue of New Zealand Lepidoptera, revised the incorrect synonymy given by Meyrick and placed this species within the Aletia genus.

margined either outwardly or inwardly with pale ochraceous; the discoidal spots and a spot below the orbicular indicated in outline; an oblique zigzag line from the reniform to the inner margin, followed by a subangulated series of lunate markings from costa to inner margin, an extradiscal series of ill-formed hastate subconfluent black spots parallel to the outer margin; fringe blackish towards the apex; secondaries sericeous grey with a feeble lilacine tint; a broad deep brownish grey external border; fringe yellowish at base, tipped with white and intersected by a grey line; thorax greyish-green, abdomen sordid whitish, sericeous; anus yellowish; under surface of wings silvery-greyish, the primaries with the costal and external borders finely white-speckled but not distinctly; an ochraceous tuft close to the base covering a bare and swollen space at the base of the costal vein; a slightly arched grey discal line; internal area white at base; secondaries paler than primaries; the fringe yellowish at base; an arched grey discal line; discocellulars greyish: body below sordid white.

Fresh specimens can be distinguished from the smaller I. panda through the scaling of the inner edge of the subterminal line.

[2] Adults of this species are on the wing from November to April, although most observations have been in the January to March period.

The adult larvae are about 38mm long, with a light green shiny head and a body which is "very vivid green, paler and bluer underneath", with a "conspicuous yellowish sub-dorsal line and a broad white lateral line".