Izatha convulsella

The wingspan is 14–20 mm for males and 13.5–19 mm for females. Hudson described the larva of this species as follows:

The larva, which lives under the scales of the bark of Rimu trees (Dacrydium cupressinum), is about 1⁄2 inch in length, stout with a horny dark brown head and two horny plates on the second segment. The rest of the body is dull yellowish-brown with six rows of horny warts each emitting a long bristle. Hudson described the adult of this species as follows:

The expansion of the wings is about 1⁄2 inch. The fore-wings are rather narrow with the termen oblique, dull bluish-grey irregularly speckled with black and with white markings; there is a dark basal patch; a rather broad, curved, white band from the costa at about 1⁄4; a very indefinite darker central band; an indistinct whitish line from 2⁄3 of the costa to the tornus; there are three or four small black marks in the disc before the middle; a black spot beyond the middle and a much fainter spot before the apex; a series of marginal dots extend from the costa at about 3⁄4 to the tornus. The hind-wings are greyish-ochreous, darker towards the apex and termen. This species is very similar in appearance to its close relation I. gekkonella. The most accurate way to confirm the identity of specimens is by dissection of the male genitalia as I. …

This species is endemic to New Zealand. It is widespread in the eastern part of the South Island. In the North Island, it has only been recorded from Wellington, Ōtaki, Palmerston North, Taihape and Waipawa. This species is not found in Auckland.