1 1/4-1 5/8" (32-41 mm). FW patterned; FW fairly plain. Male dark brown, especially on HW above; female warmer brown, mottled with lighter brown on HW above. Both sexes have rows of darker wedge-shaped spots crossing FW, with small glassy dots along median row and a few small white spots
in the submarginal row. Below, generally lighter; HW has white patches near margin in populations outside California. White HW fringes.
White-fringed populations of Juvenal's and Pacuvius duskywings have partial brown fringe checkering. Funereal Duskywing has narrower, longer FW and squared HW.
Several species of oaks (Quercus) are host plants
Up to 3 broods; March-November in Arizona-New Mexico; spring, fall, and sometimes January in California.
Valleys, mountains, and foothills among oak scrub and savannah; redwood canyons and hills.
California, Arizona, New Mexico, Texas, and Mexico south to Colombia.
Mournful Duskywings seek hilltops and perch on low vegetation. Scudder's Duskywing (E. scudderi) of southeastern Arizona and Mexico is rather similar and also white-fringed. It has faint brown checkering in the fringes, however, and the hind wing below lacks whitish patches near the margin.