Farnobia is a genus of snout moths. It was described by Heinrich in 1956, and contains the species F. quadripuncta. It is found in Costa Rica, Panama, French Guiana and Colombia. The wingspan is 21–24 mm. The forewings are brown with a purplish tint. The costal area is dusted with ocherous gray, extending into the cell at the middle. The hindwings are whitish and semi-hyaline, with a narrow dark line along the termen and dark shading on some of the veins.