Stenoma periaula is a moth of the Depressariidae family. It is found in French Guiana. The wingspan is about 16 mm. The forewings are dark violet-grey with the costal edge white throughout, more strongly towards the base. There is a hardly curved white line from the middle of the costa to before three-fourths of the dorsum and a white line with waved anterior edge running around the apex and termen, marked with a series of small black dots on the marginal edge. The hindwings are rather dark grey.