Catoryctis nonolinea is a moth in the Xyloryctidae family. It was described by Lucas in 1894. It is found in Australia, where it has been recorded from New South Wales and Queensland. The wingspan is 13-15 mm. The forewings are rich chocolate-fuscous with ochreous-silvery lines and a slender attenuated streak immediately beneath the costa from the base to two-fifths, a thin line immediately beneath this at two-thirds running obliquely to two-thirds of the costa, two short thin lines immediately beyond this and parallel, a short arrow-head line immediately beyond broadening in the apical angle to the apex, with a tendency to divide at the apex, a moderately broad straight line from just before the middle of the wing to one-third of the hindmargin, with a tendency to divide before the hindma