Stenoma externella is a moth of the family Depressariidae. It is found in Brazil (Amazonas) and Guyana."Stenoma Zeller, 1839" at Markku Savela's Lepidoptera and Some Other Life Forms
The wingspan is about 17 mm. The forewings are pale yellow ochreous with a dark fuscous dorsal blotch extending from the base to the middle and reaching three-fourths across the wing, posteriorly obliquely rounded. There is a fascia-like patch of fuscous suffusion from beyond the cell to the dorsum before the tornus and a narrow terminal interrupted fascia of fuscous suffusion, leaving a terminal edge of ground colour. The hindwings are grey.Description of Stenoma aggerata in Exotic Microlepidoptera 1 (14): 428
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