The Leach’s Grass-veneer has a wingspan of about 1 inch. The forewing is brown with a broad, silvery white stripe from the base to the subterminal area. It is tapered at both ends. The stripe touches the costal margin at the base of the wing. The terminal line is black and the fringe is cream-colored. The hindwing is plain off-white.
The frequency of occurrence is not known. It was photographed at Neale Woods in early September 2012 and again in early September 2013 coming to artificial lights. Adults and larvae hide in the grass during the day.
The larvae feed on grasses. The species overwinters in grass as a partially grown larva. Feeding resumes in early spring, mainly at night. During the night, adult females fly over grass and scatter their eggs. One generation is completed in 4 – 6 weeks. There are 2 to 4 generations a year.
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