Adults of L. reginera rest with their hindwings tucked underneath their forewings, giving them an arrowhead-like or tented shape. The forewings are dark greyish-brown with three green spots, one of which is bordered with white. The hindwing is primarily whitishgray and fades into a darker gray color closer to the margin. Their wingspan is 21–30 mm, significantly smaller than most other members of the Noctuidae family.