Nacoleia mesochlora is a moth in the family Crambidae. It was described by Edward Meyrick in 1884. It is found in Australia, where it has been recorded from Queensland,[1] the Northern Territory, New South Wales, Victoria, South Australia and Western Australia.[2]
The wingspan is 14–16 mm. The forewings are pale dull whitish ochreous. The first line is straight, thick and blackish, from one-third of the costa to two-fifths of the inner margin. The basal area up to this line is rather dark fuscous. The second line is thick, blackish and runs from three-fourths of the costa to beyond the middle of the inner margin. The hind-marginal area beyond this line is rather dark fuscous and there is a cloudy fuscous discal spot, as well as three small semicircular blackish-fuscous centred marks on the costa between first and second lines. The hindwings are pale ochreous yellow, with a broad rather dark fuscous hind-marginal band.[3]