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A medium-size moth (3.5-4.0 cm wingspan). Forewings are dark grey-brown or brown. The basal, antemedian, postmedian and terminal lines are bordered by pale scales, and are prominent. The most distinctive marking is the large silver stigma, which curves in a gentle arc from the antemedian line to the postmedian line. There is a narrow patch of paler yellow brown scales beneath the outer half of the stigma and large patches of dark brown metallic scales between the postmedian and terminal lines. Hindwings are dark brown with an indistinct discal mark and median band. The antennae are simple and both the sexes are essentially alike. Similar to the smaller A. rubida, but the much larger and more prominent stigma will identify flagellum.