Stenoma alluvialis is a moth of the Depressariidae family. It is found in Peru and French Guiana. The wingspan is 24–25 mm. The forewings are lilac-whitish, the costal edge white and the dorsal area beneath the fold tinged lilac-brownish, with scattereddark fuscous scales, a few lilac-brown scales scattered in the disc about the stigmata. There is a fine line of dark fuscous scales along the dorsal edge from about one-fourth to the tornus. The stigmata are dark fuscous, the plical very obliquely beyond the first discal, the second discal transverse-linear. There are cloudy grey subtriangular spots on the costa about the middle and four-fifths, from the second a curved series of cloudy fuscous dots to the tornus, between veins three and nine a curved series of rather larger similar dots mid