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A medium-sized (3.4-3.6 cm wingspan) rusty-brown or yellow-brown, or ocassionaly pink moth with few markings, the most prominent being the dark, somewhat smeared and elongated reniform spot. The postmedian and subterminal lines are usually visible as faint thin dark lines, edged with paler scales. The hindwings are like the forewings in color, but paler on the basal half and darker on the distal half, with an indistinct discal mark. Male antennae setose; female simple. Sexes similar. Paradiarsia littoralis is similar but smaller and has dark grey or black hindwings and bipectinate male antennae. Until recently treated as A. indela or A. popofensis, which are now treated as subspecies of A. inficita (Troubridge and Lafontaine, in press). Older literature (i.e. Bowman, 1951) places inficita in the genus Agroperina

Poorly known. A. inficita is sometimes common nectaring at flowers at dusk, and also comes to light. There is a single anuual brood. The larvae are apparently unknown. Although found in the foothills at Calgary and west of Bragg Creek, it has not yet been taken elsewhere in the foothills or mountain meadows in AB. The populations of popofensis in western Canada and the adjacent states have been treated as both ssp. lineosa and ssp. indela. Cook (1930) stated these were merely colour forms, although Hodges et al (1983) still treat these names as valid subspecies. Until recently this species was placed in the genus Agroperina, but Poole (1989) synonomized Agroperina and Apamea.