The taxonomy of this species is in need of revision and L. xyrias likely belongs to a separate genus.

This species was described by Edward Meyrick in 1931 from a specimen collected at "Blackmillar" (Black Miller Stream) at Kaikōura by Stewart Lindsay in December.

[1][2][3] George Hudson discussed and illustrated this species in his 1939 publication A supplement to the Butterflies and Moths of New Zealand.

Forewings elongate, costa gently arched, apex obtuse, termen very obliquely rounded; brown, suffusedly irrodated fuscous on costal half, except posteriorly; a slightly raised dark fuscous dot beneath fold at 1⁄4; cilia light grey, basal half overlaid paler, outer third whitish-grey.

[4] This species has been classified as having the "Data Deficient" conservation status under the New Zealand Threat Classification System.