Hydriomena clarkei

Howes described the female adult of the species as follows:

♀︎ 25 mm. Head and appendages, thorax, and abdomen grey-brown. Forewings dark grey-brown, with the veins distinctly shown by being irrorated with black and grey to 2⁄3 across wing, and from there to termen irrorated with yellow and black; a black line edges costa, interrupted by two white marks at 1⁄3, followed by three white marks at 1⁄2, two white marks at 3⁄4, another close to apex : these marks all rather indistinct. Termen distinctly edged with a thin black line, interrupted by yellow dots at the ends of the veins. Hindwings grey suffused with darker grey, and with a rather indistinct series of transverse irregular fines; termen distinctly edged with a thin dark line, small yellow dots interrupting it on the veins : cilia light grey with a dark-grey line at base.

This species is endemic to New Zealand. It has occurred in Dunedin, Central Otago and at the Otago Lakes. H. clarkei is considered extinct at its type locality of Flagstaff Hill.

Much of the biology of H. clarkei is unknown. This species is on the wing in February and March.