Trachypepla leucoplanetis

Meyrick described this species as follows:

Male. 11-12+1⁄2- mm. Head dark fuscous, face white. Palpi dark fuscous mixed with white, internally whitish. Antennae dark fuscous. Thorax dark fuscous, posteriorly mixed with white. Abdomen whitish-grey. Legs dark fuscous, middle tibiae with central and apical whitish rings, posterior tibiae whitish, all tarsi with whitish rings at apex of joints. Forewings moderate or rather short, costa moderately arched, apex round-pointed, hindmargin obliquely rounded; white, very faintly ochreous-tinged in disc; base of costa dark fuscous, dilating basally to touch inner margin; a large fuscous-grey transverse patch, its inner edge nearly straight, extending from middle of costa to middle of inner margin, outer edge convex below middle, extending from f of costa to middle of hindmargin, margins irregularly mixed with blackish, and containing some white scales in disc and towards anal angle, and some spots of raised ferruginous scales partially margined with blackish; a grey spot on costa before apex, and a small irregular grey patch extending along upper part of hindmargin : cilia grey, white at base along hindmargin and below anal angle. Hindwings grey, apex darker; cilia grey. This species is the smallest in the genus Trachypepla and can be variable in the markings on the forewings. …

This species is endemic to New Zealand. It has been found on both the North and South Islands, including in Auckland, Hamilton, National Park, Wellington, at the Ōtira River and on Mount Arthur's lower slopes. Both T. H. Davies and George Hudson were of the opinion that this species is rarely observed.

Adults of this species are on the wing from October until February. This species has been collected by beating foliage.

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