Tactusa virga is a moth of the Micronoctuidae family. It is known from Yunnan in China. The wingspan is about 11.5 mm. The forewings are narrow. The head, patagia and base of the costa are black and the ground colour of the forewings is light brown, with a black costal-medial patch and a black subterminal and terminal area, including the fringe. The cross-lines are absent, except for the terminal line, which is marked by black intervenal dots. The reniform stigma is beige, outlined by black. The hindwings are unicolourous grey, with a discal spot and the fringe is grey. The ventral surface is unicolorous light brown.