Myriostephes matura is a moth in the Crambidae family. It was described by Meyrick in 1884. It is found in Australia, where it has been recorded from Queensland and New South Wales. The wingspan is 11–14 mm. The forewings are ochreous-yellow, often shading to brownish ochreous posteriorly. The costal edge is dark fuscous from the base to beyond the middle and then yellowish white to four-fifths. The lines are ochreous-fuscous. The hindwings are yellow ochreous, posteriorly suffused with fuscous and with a faint discal spot.