Phylloxiphia illustris is a moth of the family Sphingidae. It is known from lowland forest from Liberia to the Congo and western Uganda. The length of the forewings is 27–29 mm. The forewings and body are straw-coloured. The forewing has a number of irregular, dark transverse lines. The fringe is dark brown. The hindwings are strongly produced at the tornus and pinkish red, although the tornal area is straw-coloured.