Paectes tumida is a moth in the Noctuidae family. It is found in Colombia (Villavicencio), Guyana, Suriname and French Guiana. The forewing length is 10.9 mm for males and 11.5 mm for females. The costal area of the forewings is brown. The basal area is a mixture of white, pale-ferruginous and brown scales. There is a not well-defined ovate spot. The hindwings have a marginal shading of dark gray and the veins are heavily highlighted in dark gray. The areas between the veins are white. The anal fold is white with a dark-gray striped pattern.