Antaeotricha monosaris is a moth of the Depressariidae family. It is found in Guyana, French Guiana and Brazil. The wingspan is about 15 mm. The forewings are white, in females slightly sprinkled with dark fuscous. The dorsal half is dark fuscous throughout, slightly wider on the posterior third, not quite reaching the termen at the upper edge. There is a dark fuscous line from the base of the costa, not quite reaching a dark fuscous longitudinal mark in the disc at one-third, as well as very oblique rather dark fuscous lines from just beneath the costa at one-fifth and two-fifths, variable in development and the first sometimes little marked, but neither reaching the dark dorsal area. An almost straight dark fuscous line is found from three-fourths of the costa to the extremity of the dar