Baeonoma mastodes is a moth of the family Depressariidae. It is found in French GuianaBaeonoma at funet Argentina and BrazilMitteilungen der Münchner Entomologischen Gesellschaft
The wingspan is 15–19 mm. The forewings are white with a rather thick suffused dark fuscous streak along the costa from the base to beyond the middle and a rounded-triangular dark fuscous blotch on the middle of the dorsum, reaching half across the wing. There is a slight spot of fuscous irroration on the end of the cell. There is a variable rounded blotch of dark fuscous irroration or suffusion extending over the termen. The hindwings are grey.Exot. Microlep. 1 (16): 508
References