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A small (approx. 2.5 cm wingspan) moth with dark grey-brown forewings and lighter dirty white hindwings. The median area of the forewings, especially in the lower half, is black or nearly so. The basal area is slightly paler grey-brown, and the outer third is even lighter grey-brown, with some rusty-brown scaling. Both the orbicular and in particular the large reniform spot are visible. The hindwings darken distally and are usually lighter in males (the illustrated specimens are both females). Similar to N. subjuncta and in particular N. tonsa, both of which may occur in the same area. The genitalia must be examined for positive identification. Adults of all species of Neoligia, along with the genitalia of both sexes, are illustrated in Troubridge and Lafontaine, 2002)

Very poorly known. Adults are nocturnal and come to light. There appears to be a single brood, which flies from mid July through late August. The Alberta specimens were collected August 14. Nothing is known of the larval host plants.

Another of the dry woodland western moths that barely reach Alberta in the extreme southwestern corner of the province. Troubridge and Lafontaine recently (2002) revised the entirely North American "Oligia" semicana group, and placed all 17 species in a new genus, Neoligia. Neoligia lillooet was described at the same time, along with 11 other new species! Colored illustrations of both the adults and the genitalia of both sexes, which are illustrated in black and white in the original publication, can be downloaded from Canadian Biodiversity Information Facility.